Support » Fixing WordPress » Unable to assign categories

  • chuchunochichi


    In the past I have been able to assign categories to posts but for no apparent reason, the following message appears in the category window on the editing page:
    Warning: call_user_func() []: First argument is expected to be a valid callback in /websites/123reg/LinuxPackage21/wh/at/gr/ on line 924

    I am a non-technical silver surfer, keen to keep my little site going, so would appreciate any simple to understand advice.
    My site is

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