Kivy Bug with Builder

gistfile1.txt

Python File:

from kivy.app import App
from kivy.uix.label import Label
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen

Builder.load_file('Test1.kv')
 
class ScreenManager(ScreenManager):
    pass

class Screen(Screen):
    pass
 
 
class Test1(App):

    def build(self):
        self.sm = ScreenManager()
        return self.sm

    def on_start(self):
        Layout = self.sm.ids['screen'].ids['fl_Rec']
        Layout.add_widget(Label(text='hi'))


if __name__ == '__main__':
    Test1().run()


Test1.kv:

<ScreenManager>:
    id: screen_manager
    Screen:
        id:screen

<Screen>:
    id:screen
    FloatLayout:
        id:fl_Rec                
        Label:
            pos: 0,20
            text: "Hello World Good Morning !"


Debug Output:

[←[1;32mINFO←[0m   ] [Logger      ] Record log in C:\Users\XXXXXX\.kivy\logs\kivy_21-12-21_54.txt
[←[1;32mINFO←[0m   ] [deps        ] Successfully imported "kivy_deps.angle" 0.3.0
[←[1;32mINFO←[0m   ] [deps        ] Successfully imported "kivy_deps.glew" 0.3.0
[←[1;32mINFO←[0m   ] [deps        ] Successfully imported "kivy_deps.sdl2" 0.3.1
[←[1;32mINFO←[0m   ] [Kivy        ] v2.0.0
[←[1;32mINFO←[0m   ] [Kivy        ] Installed at "C:\ProgramData\Anaconda3\envs\NewPanda3d\lib\site-packages\kivy\__init__.py"
[←[1;32mINFO←[0m   ] [Python      ] v3.7.10 (default, Feb 26 2021, 13:06:18) [MSC v.1916 64 bit (AMD64)]
[←[1;32mINFO←[0m   ] [Python      ] Interpreter at "C:\ProgramData\Anaconda3\envs\NewPanda3d\python.exe"
[←[1;32mINFO←[0m   ] [Factory     ] 186 symbols loaded
[←[1;36mDEBUG←[0m  ] [Cache       ] register <kv.lang> with limit=None, timeout=None
[←[1;36mDEBUG←[0m  ] [Cache       ] register <kv.image> with limit=None, timeout=60
[←[1;36mDEBUG←[0m  ] [Cache       ] register <kv.atlas> with limit=None, timeout=None
[←[1;32mINFO←[0m   ] [Image       ] Providers: img_tex, img_dds, img_sdl2, img_pil (img_ffpyplayer ignored)
[←[1;36mDEBUG←[0m  ] [Cache       ] register <kv.texture> with limit=1000, timeout=60
[←[1;36mDEBUG←[0m  ] [Cache       ] register <kv.shader> with limit=1000, timeout=3600
[←[1;32mINFO←[0m   ] [Text        ] Provider: sdl2
[←[1;36mDEBUG←[0m  ] [App         ] Loading kv <c:\Users\wiredworks\Documents\Simulation-Studio2\StudioInterface\test1.kv>
[←[1;32mINFO←[0m   ] [Window      ] Provider: sdl2
[←[1;32mINFO←[0m   ] [GL          ] Using the "OpenGL" graphics system
[←[1;32mINFO←[0m   ] [GL          ] GLEW initialization succeeded
[←[1;36mDEBUG←[0m  ] [GL          ] available extensions: b'GL_AMD_multi_draw_indirect GL_AMD_seamless_cubemap_per_texture GL_ARB_arrays_of_arrays GL_ARB_base_instance GL_ARB_bindless_texture GL_ARB_blend_func_extended GL_ARB_buffer_storage GL_ARB_cl_event GL_ARB_clear_buffer_object GL_ARB_clear_texture GL_ARB_clip_control GL_ARB_color_buffer_float GL_ARB_compatibility GL_ARB_compressed_texture_pixel_storage GL_ARB_conservative_depth GL_ARB_compute_shader GL_ARB_compute_variable_group_size GL_ARB_conditional_render_inverted GL_ARB_copy_buffer GL_ARB_copy_image GL_ARB_cull_distance GL_ARB_debug_output GL_ARB_depth_buffer_float GL_ARB_depth_clamp GL_ARB_depth_texture GL_ARB_derivative_control GL_ARB_direct_state_access GL_ARB_draw_buffers GL_ARB_draw_buffers_blend GL_ARB_draw_indirect GL_ARB_draw_elements_base_vertex GL_ARB_draw_instanced GL_ARB_enhanced_layouts GL_ARB_ES2_compatibility GL_ARB_ES3_compatibility GL_ARB_ES3_1_compatibility GL_ARB_ES3_2_compatibility GL_ARB_explicit_attrib_location GL_ARB_explicit_uniform_location GL_ARB_fragment_coord_conventions GL_ARB_fragment_layer_viewport GL_ARB_fragment_program GL_ARB_fragment_program_shadow GL_ARB_fragment_shader GL_ARB_framebuffer_no_attachments GL_ARB_framebuffer_object GL_ARB_framebuffer_sRGB GL_ARB_geometry_shader4 GL_ARB_get_program_binary GL_ARB_get_texture_sub_image GL_ARB_gl_spirv GL_ARB_gpu_shader5 GL_ARB_gpu_shader_fp64 GL_ARB_gpu_shader_int64 GL_ARB_half_float_pixel GL_ARB_half_float_vertex GL_ARB_imaging GL_ARB_indirect_parameters GL_ARB_instanced_arrays GL_ARB_internalformat_query GL_ARB_internalformat_query2 GL_ARB_invalidate_subdata GL_ARB_map_buffer_alignment GL_ARB_map_buffer_range GL_ARB_multi_bind GL_ARB_multi_draw_indirect GL_ARB_multisample GL_ARB_multitexture GL_ARB_occlusion_query GL_ARB_occlusion_query2 GL_ARB_parallel_shader_compile GL_ARB_pipeline_statistics_query GL_ARB_pixel_buffer_object GL_ARB_point_parameters GL_ARB_point_sprite GL_ARB_program_interface_query GL_ARB_provoking_vertex GL_ARB_query_buffer_object GL_ARB_robust_buffer_access_behavior GL_ARB_robustness GL_ARB_sample_shading GL_ARB_sampler_objects GL_ARB_seamless_cube_map GL_ARB_seamless_cubemap_per_texture GL_ARB_separate_shader_objects GL_ARB_shader_atomic_counter_ops GL_ARB_shader_atomic_counters GL_ARB_shader_ballot GL_ARB_shader_bit_encoding GL_ARB_shader_clock GL_ARB_shader_draw_parameters GL_ARB_shader_group_vote GL_ARB_shader_image_load_store GL_ARB_shader_image_size GL_ARB_shader_objects GL_ARB_shader_precision GL_ARB_shader_storage_buffer_object GL_ARB_shader_subroutine GL_ARB_shader_texture_image_samples GL_ARB_shader_texture_lod GL_ARB_shading_language_100 GL_ARB_shading_language_420pack GL_ARB_shading_language_include GL_ARB_shading_language_packing GL_ARB_shadow GL_ARB_sparse_buffer GL_ARB_sparse_texture GL_ARB_stencil_texturing GL_ARB_sync GL_ARB_tessellation_shader GL_ARB_texture_barrier GL_ARB_texture_border_clamp GL_ARB_texture_buffer_object GL_ARB_texture_buffer_object_rgb32 GL_ARB_texture_buffer_range GL_ARB_texture_compression GL_ARB_texture_compression_bptc GL_ARB_texture_compression_rgtc GL_ARB_texture_cube_map GL_ARB_texture_cube_map_array GL_ARB_texture_env_add GL_ARB_texture_env_combine GL_ARB_texture_env_crossbar GL_ARB_texture_env_dot3 GL_ARB_texture_float GL_ARB_texture_gather GL_ARB_texture_mirror_clamp_to_edge GL_ARB_texture_mirrored_repeat GL_ARB_texture_multisample GL_ARB_texture_non_power_of_two GL_ARB_texture_query_levels GL_ARB_texture_query_lod GL_ARB_texture_rectangle GL_ARB_texture_rg GL_ARB_texture_rgb10_a2ui GL_ARB_texture_stencil8 GL_ARB_texture_storage GL_ARB_texture_storage_multisample GL_ARB_texture_swizzle GL_ARB_texture_view GL_ARB_timer_query GL_ARB_transform_feedback2 GL_ARB_transform_feedback3 GL_ARB_transform_feedback_instanced GL_ARB_transform_feedback_overflow_query GL_ARB_transpose_matrix GL_ARB_uniform_buffer_object GL_ARB_vertex_array_bgra GL_ARB_vertex_array_object GL_ARB_vertex_attrib_64bit GL_ARB_vertex_attrib_binding GL_ARB_vertex_buffer_object GL_ARB_vertex_program GL_ARB_vertex_shader GL_ARB_vertex_type_10f_11f_11f_rev GL_ARB_vertex_type_2_10_10_10_rev GL_ARB_viewport_array GL_ARB_window_pos GL_ATI_draw_buffers GL_ATI_texture_float GL_ATI_texture_mirror_once GL_S3_s3tc GL_EXT_texture_env_add GL_EXT_abgr GL_EXT_bgra GL_EXT_bindable_uniform GL_EXT_blend_color GL_EXT_blend_equation_separate GL_EXT_blend_func_separate GL_EXT_blend_minmax GL_EXT_blend_subtract GL_EXT_compiled_vertex_array GL_EXT_Cg_shader GL_EXT_depth_bounds_test GL_EXT_direct_state_access GL_EXT_draw_buffers2 GL_EXT_draw_instanced GL_EXT_draw_range_elements GL_EXT_fog_coord GL_EXT_framebuffer_blit GL_EXT_framebuffer_multisample GL_EXTX_framebuffer_mixed_formats GL_EXT_framebuffer_multisample_blit_scaled GL_EXT_framebuffer_object GL_EXT_framebuffer_sRGB GL_EXT_geometry_shader4 GL_EXT_gpu_program_parameters GL_EXT_gpu_shader4 GL_EXT_multi_draw_arrays GL_EXT_packed_depth_stencil GL_EXT_packed_float GL_EXT_packed_pixels GL_EXT_pixel_buffer_object GL_EXT_point_parameters GL_EXT_polygon_offset_clamp GL_EXT_provoking_vertex GL_EXT_rescale_normal GL_EXT_secondary_color GL_EXT_separate_shader_objects GL_EXT_separate_specular_color GL_EXT_shader_image_load_store GL_EXT_shader_integer_mix GL_EXT_shadow_funcs GL_EXT_stencil_two_side GL_EXT_stencil_wrap GL_EXT_texture3D GL_EXT_texture_array GL_EXT_texture_buffer_object GL_EXT_texture_compression_dxt1 GL_EXT_texture_compression_latc GL_EXT_texture_compression_rgtc GL_EXT_texture_compression_s3tc GL_EXT_texture_cube_map GL_EXT_texture_edge_clamp GL_EXT_texture_env_combine GL_EXT_texture_env_dot3 GL_EXT_texture_filter_anisotropic GL_EXT_texture_integer GL_EXT_texture_lod GL_EXT_texture_lod_bias GL_EXT_texture_mirror_clamp GL_EXT_texture_object GL_EXT_texture_shared_exponent GL_EXT_texture_sRGB GL_EXT_texture_sRGB_decode GL_EXT_texture_storage GL_EXT_texture_swizzle GL_EXT_timer_query GL_EXT_transform_feedback2 GL_EXT_vertex_array GL_EXT_vertex_array_bgra GL_EXT_vertex_attrib_64bit GL_EXT_window_rectangles GL_EXT_import_sync_object GL_IBM_rasterpos_clip GL_IBM_texture_mirrored_repeat GL_KHR_context_flush_control GL_KHR_debug GL_EXT_memory_object GL_EXT_memory_object_win32 GL_EXT_win32_keyed_mutex GL_KHR_no_error GL_KHR_robust_buffer_access_behavior GL_KHR_robustness GL_EXT_semaphore GL_EXT_semaphore_win32 GL_KTX_buffer_region GL_NV_alpha_to_coverage_dither_control GL_NV_bindless_multi_draw_indirect GL_NV_bindless_multi_draw_indirect_count GL_NV_bindless_texture GL_NV_blend_equation_advanced GL_NV_blend_square GL_NV_command_list GL_NV_compute_program5 GL_NV_conditional_render GL_NV_copy_depth_to_color GL_NV_copy_image GL_NV_deep_texture3D GL_NV_depth_buffer_float GL_NV_depth_clamp GL_NV_draw_texture GL_NV_draw_vulkan_image GL_NV_ES1_1_compatibility GL_NV_ES3_1_compatibility GL_NV_explicit_multisample GL_NV_fence GL_NV_float_buffer GL_NV_fog_distance GL_NV_fragment_program GL_NV_fragment_program_option GL_NV_fragment_program2 GL_NV_framebuffer_multisample_coverage GL_NV_geometry_shader4 GL_NV_gpu_program4 GL_NV_internalformat_sample_query GL_NV_gpu_program4_1 GL_NV_gpu_program5 GL_NV_gpu_program5_mem_extended GL_NV_gpu_program_fp64 GL_NV_gpu_shader5 GL_NV_half_float GL_NV_light_max_exponent GL_NV_multisample_coverage GL_NV_multisample_filter_hint GL_NV_occlusion_query GL_NV_packed_depth_stencil GL_NV_parameter_buffer_object GL_NV_parameter_buffer_object2 GL_NV_path_rendering GL_NV_pixel_data_range GL_NV_point_sprite GL_NV_primitive_restart GL_NV_register_combiners GL_NV_register_combiners2 GL_NV_shader_atomic_counters GL_NV_shader_atomic_float GL_NV_shader_buffer_load GL_NV_shader_storage_buffer_object GL_NV_texgen_reflection GL_NV_texture_barrier GL_NV_texture_compression_vtc GL_NV_texture_env_combine4 GL_NV_texture_multisample GL_NV_texture_rectangle GL_NV_texture_shader GL_NV_texture_shader2 GL_NV_texture_shader3 GL_NV_transform_feedback GL_NV_transform_feedback2 GL_NV_uniform_buffer_unified_memory GL_NV_vertex_array_range GL_NV_vertex_array_range2 GL_NV_vertex_attrib_integer_64bit GL_NV_vertex_buffer_unified_memory GL_NV_vertex_program GL_NV_vertex_program1_1 GL_NV_vertex_program2 GL_NV_vertex_program2_option GL_NV_vertex_program3 GL_NV_video_capture GL_NVX_conditional_render GL_NVX_gpu_memory_info GL_NVX_multigpu_info GL_NVX_nvenc_interop GL_NV_shader_thread_group GL_NV_shader_thread_shuffle GL_KHR_blend_equation_advanced GL_SGIS_generate_mipmap GL_SGIS_texture_lod GL_SGIX_depth_texture GL_SGIX_shadow GL_SUN_slice_accum GL_WIN_swap_hint WGL_EXT_swap_control '
[←[1;36mDEBUG←[0m  ] [GL          ] glShaderBinary is not available
[←[1;32mINFO←[0m   ] [GL          ] Backend used <glew>
[←[1;32mINFO←[0m   ] [GL          ] OpenGL version <b'4.5.0 NVIDIA 385.69'>
[←[1;32mINFO←[0m   ] [GL          ] OpenGL vendor <b'NVIDIA Corporation'>
[←[1;32mINFO←[0m   ] [GL          ] OpenGL renderer <b'Quadro K2000/PCIe/SSE2'>
[←[1;32mINFO←[0m   ] [GL          ] OpenGL parsed version: 4, 5
[←[1;32mINFO←[0m   ] [GL          ] Shading version <b'4.50 NVIDIA'>
[←[1;32mINFO←[0m   ] [GL          ] Texture max size <16384>
[←[1;32mINFO←[0m   ] [GL          ] Texture max units <32>
[←[1;36mDEBUG←[0m  ] [Shader      ] Fragment compiled successfully
[←[1;36mDEBUG←[0m  ] [Shader      ] Vertex compiled successfully
[←[1;36mDEBUG←[0m  ] [ImageSDL2   ] Load <C:\ProgramData\Anaconda3\envs\NewPanda3d\lib\site-packages\kivy\data\glsl\default.png>
[←[1;32mINFO←[0m   ] [Window      ] auto add sdl2 input provider
[←[1;32mINFO←[0m   ] [Window      ] virtual keyboard allowed, single mode, docked
[←[1;36mDEBUG←[0m  ] [Resource    ] add <C:\Windows\Fonts> in path list
[←[1;36mDEBUG←[0m  ] [Resource    ] add <C:\ProgramData\Anaconda3\envs\NewPanda3d\lib\site-packages\kivy\data\fonts> in path list
[←[1;36mDEBUG←[0m  ] [Base        ] Create provider from mouse
[←[1;36mDEBUG←[0m  ] [Base        ] Create provider from wm_touch
[←[1;36mDEBUG←[0m  ] [Base        ] Create provider from wm_pen
[←[1;32mINFO←[0m   ] [Base        ] Start application main loop
[←[1;32mINFO←[0m   ] [GL          ] NPOT texture support is available