I think that is caused by tabbed_products_pro.php.
There are two files with the same name...
make sure the one in languages folder goes to
\includes\languages\english\extra_definitions (and check the file size)
then make sure the one in Modules folder goes to
\includes\modules (check and match the file size)
the files both share the same name, but are different sizes...I had this problem as well, I fixed it by correcting this mistake.
not sure if it'll work for you, but worth a shot. :)
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