Cannot add a child that doesn't have a YogaNode to a parent without a measure function! (Trying to add a 'ReactRawTextShadowNode' to a 'LayoutShadow

Question

According on this tutorial, this is my component which I use for a react base component as a side bar component, and its working very well, but the problem starts when I change list items from <Text> to <Button>

    import { Text, Container, Header, Content, List, ListItem, TextBody, Button } from 'native-base';
import { StackNavigator, DrawerNavigator } from 'react-navigation'

export default class SideBar extends Component {

    render() {
        return (
            <Content style={{ backgroundColor: '#ffffff' }}>
                <Container>

                    <Content>
                        <List>
                            <ListItem>
                                <Text>First</Text>
                            </ListItem>
                            <ListItem>
                                <Text>Secount</Text>
                            </ListItem>
                            <ListItem>
                                <Text>Third</Text>
                            </ListItem>
                        </List>
                    </Content>
                </Container>
            </Content>
        );
    }
}

I get this error:

cant add a child that doesn't have a YogaNede to parent without the measure function !(Trying to Add a 'ReactRawTextshadow' to a 'LayoutShadowNode' )

cant understand this error at all and didn't saw any thing about it on net!

> Cannot add a child that doesn't have a YogaNode to a parent without a
> measure function! (Trying to add a 'ReactRawTextShadowNode' to a
> 'LayoutShadowNode') addChildAt
>     ReactShadowNodeImpl.java:199 addChildAt
>     ReactShadowNodeImpl.java:54 setChildren
>     UIImplementation.java:472 setChildren
>     UIManagerModule.java:436 invoke
>     Method.java invoke
>     Method.java:372 invoke
>     JavaMethodWrapper.java:374 invoke
>     JavaModuleWrapper.java:162 run
>     NativeRunnable.java handleCallback
>     Handler.java:739 dispatchMessage
>     Handler.java:95 dispatchMessage
>     MessageQueueThreadHandler.java:31 loop
>     Looper.java:135 run
>     MessageQueueThreadImpl.java:194 run
>     Thread.java:818

Answer 1

For others landing on this page due to the same error message as the OP, there are a whole host of issues that can cause same error message.
There is an GitHub issue surrounding this generic error message.

Probably the most common reasons are:

• text to be rendered is not wrapped in <Text> tags
• syntax error in JSX (for example, a ;, or a malformed tag)

• a space between JSX comments and a JSX tag, if you use Prettier
  (it seems Prettier puts an automatic ; insertion,
  (solution: move the JSX comment to its own line)

• some value is assumed to be null, but it's undefined, or an ''(empty string).
  In the case of an '', it would need to be wrapped in <Text> (see 1st item above)

• not wrapping child tags (ScrollView in particular)
• space between two adjacent tags
• an issue with CSS

  If a CSS node has measure defined, the layout algorithm will not visit its children. Even more, it asserts that you don't add children to nodes with measure functions.

I highly recommend taking a gander if you are having trouble finding the source of your error: https://github.com/facebook/react-native/issues/13243

As one person wrote:

To summarize:
This issue is about what React Native perceives to be mal formatted JSX (usually occurring on Android render) and this thread has done a good job documenting the many forms this malformatted JSX can come in.

It Still doesn't solve the need for developers to comb through their code line by line looking for a random semicolons or spaces.

If there is a way to have the stack trace be more specific about the specific offending character or error, that would probably save devs hours of sad debugging..