class_parents(): object or string expected in panels_panel_context_render() (line 312 of modules\panels\plugins\task_handlers\panel_context.inc [#2605816]

After I have installed some module required by OpenAtruim, I go to my home page (?q=node) and get this problem. I have searched with google, but there was not any useful info.
the detail error is below:
Warning: class_parents(): object or string expected in panels_panel_context_render() (line 312 of E:\wamp\www\drupal741\sites\all\modules\panels\plugins\task_handlers\panel_context.inc)

Comments

Comment #1

1 November 2015 at 12:48

chzhcpu created an issue. See original summary.

Comment #2

chzhcpu CreditAttribution: chzhcpu commented 1 November 2015 at 13:54

after i enabled some mudule, the error is missing

Comment #3

joelstein CreditAttribution: joelstein as a volunteer commented 24 October 2016 at 14:39

Weird. I had the same issue, and enabling a module fixed it for me, too.

Comment #4

kbrinner

she/her

San Diego

CreditAttribution: kbrinner commented 20 January 2017 at 21:18

This is so strange. For those who read this and are thinking 'no way', I thought 'why not' and enabled a totally random module (CAPTCHA) and boom my Panels now work and I no longer see the Warning: class_parents(): object or string expected in panels_panel_context_render() error.
I started getting this error (as well as a WSOD for Panels Variants) after upgrading Panels from 7.x-3.5 to 7.x-3.8 and CTools from 7.x-1.9 to 7.x-1.12.