XF 1.4 Error installing addons

[Andros]

unserialize(): Error at offset 0 of 7 bytes hace 40 minutos - library/XenForo/Model/StyleProperty.php:672

All the the times that i try, install addons the same error.. what is this?

 

[Paul B]

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.

 

[Mike]

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.