Ceon URI Mapping v4.x

[dbltoe]

I am getting a blank page when creating/editing any category or product. debug gives me
--> PHP Warning: Use of undefined constant FILENAME_PRODUCT_MUSIC_INFO - assumed 'FILENAME_PRODUCT_MUSIC_INFO' (this will throw an Error in a future version of PHP) in pathtomystore.com/includes/extra_datafiles/ceon_uri_mapping_product_pages.php on line 26.

I am using php 7.2. Is this the source of my problem?

PHP 7.2 is more strict than its predecessors. This define doesn't show in a plain 1.5.6c install but, a search with Developers Tool Kit looking for a define statement of the constant should find the bad define. Even if it is defined as null (two single quotes 'nothing in between') should keep 7.2 from complaining.