Error Message: call_user_func() expects parameter 1 to be a valid callb - Meta Box

This topic has 3 replies, 2 voices, and was last updated 9 years, 1 month ago by Sascha.

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March 20, 2015 at 10:11 PM #667
Sascha
Participant
Hello,

I just installed and activated the metabox plugin and the extension. It works well - great job. The problem is, if i don't active the Extension "Meta Box Group" this error messages appears:
```
Warning: call_user_func() expects parameter 1 to be a valid callback, first array member is not a valid class name or object in C:\xampp\htdocs\wordpress\wp-content\plugins\meta-box\inc\meta-box.php on line 402

Warning: call_user_func() expects parameter 1 to be a valid callback, first array member is not a valid class name or object in C:\xampp\htdocs\wordpress\wp-content\plugins\meta-box\inc\meta-box.php on line 80
```
How can I prevent that if a user doesn't activate the plugin?

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March 20, 2015 at 10:28 PM #668
Sascha
Participant
With this code it works:
```
if ( class_exists( 'RWMB_Group' ) ) {
// Register Metabox with type "group"
}
```
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March 21, 2015 at 11:15 PM #672

Anh Tran
Keymaster

Yes, that's right. When you want to register fields with type "group", you need to activate Meta Box Group extension, otherwise it will show the error like you saw.

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March 27, 2015 at 12:18 AM #701

Sascha
Participant

Thank you for the new version. Now the error no longer appears.

Thanks again for the great plugin!

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