Repro for https://github.com/edvin/tornadofx/issues/271

Issue271.fxml

<?import javafx.scene.control.TextField?>
<?import tornadofx.Field?>
<?import tornadofx.Fieldset?>
<?import tornadofx.Form?>
<Form xmlns="http://javafx.com/javafx/null" xmlns:fx="http://javafx.com/fxml/1">
    <Fieldset>
        <!--Field text=""-->
        <Field>
            <TextField/>
        </Field>
    </Fieldset>
</Form>

Issue271.kt

import javafx.application.Application
import tornadofx.*

class Main : App(Issue271::class)

fun main(args: Array<String>) = Application.launch(Main::class.java)

class Issue271 : View("My View") {
    override val root: Form by fxml()
}

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.example</groupId>
    <artifactId>issue271</artifactId>
    <version>1.0</version>
    <packaging>jar</packaging>

    <properties>
        <kotlin.version>1.1.0</kotlin.version>
        <tornadofx.version>1.7.0</tornadofx.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>no.tornado</groupId>
            <artifactId>tornadofx</artifactId>
            <version>${tornadofx.version}</version>
        </dependency>
        <dependency>
            <groupId>org.jetbrains.kotlin</groupId>
            <artifactId>kotlin-stdlib</artifactId>
            <version>${kotlin.version}</version>
        </dependency>
        <dependency>
            <groupId>org.jetbrains.kotlin</groupId>
            <artifactId>kotlin-test</artifactId>
            <version>${kotlin.version}</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <sourceDirectory>src/main/kotlin</sourceDirectory>
        <plugins>
            <plugin>
                <groupId>org.jetbrains.kotlin</groupId>
                <artifactId>kotlin-maven-plugin</artifactId>
                <version>${kotlin.version}</version>
                <executions>
                    <execution>
                        <id>compile</id>
                        <phase>compile</phase>
                        <goals>
                            <goal>compile</goal>
                        </goals>
                    </execution>
                    <execution>
                        <id>test-compile</id>
                        <phase>test-compile</phase>
                        <goals>
                            <goal>test-compile</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

</project>