NiceButton.kt

@Preview
@Composable
fun TestNiceButton() {
   NiceButton(title = "Test Button") { }
}

Composable
fun NiceButton(
   title: String,
   textColor: Color = primaryTextColor,
   backgroundColor: Color = primaryColor,
   onClick: () -> Unit
) {
   Button(
       onClick = onClick,
       modifier = Modifier
            .padding(smallSpace)
            .height(normalTouchableHeight),
       shape = RoundedCornerShape(30),
       colors = ButtonDefaults.outlinedButtonColors(
           contentColor = textColor,
           backgroundColor = backgroundColor
       )
   ) {
       Text(title)
   }
}

at line 7, use @Composable