XenForo Which file / template is wrong?

[Robert9]

I guess that xf opens a file and knows the filename, could be saved in "current filename",
then we have an error and show the usual message and "current filename"

This error does not helm me

Code:

InvalidArgumentException: Invalid XML in file. in src/XF/Util/Xml.php at line 51

    XF\Util\Xml::open() in src/XF/Util/Xml.php at line 22
    XF\Util\Xml::openFile() in src/XF/AddOn/DataType/AbstractDataType.php at line 60
    XF\AddOn\DataType\AbstractDataType->openTypeFile() in...

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