XF 1.4 Error installing addons


XenForo moderator
Staff member
Run a file health check in the ACP and confirm all files are as expected.

You could also try extracting that single file from a fresh .zip and uploading it again.


XenForo developer
Staff member
This might also be a corrupt style where a value changed format unexpectedly. The particular problematic style property would need to be reverted. I would recommend exporting your style (to back it up) and reverting properties one by one until you can get past this error.