task queue failed at step 5 playlist could not be loaded: error #1088

Hi,

I encountered some problem with Wordtube. It was working fine until my client find error message as following: “task queue failed at step 5 playlist could not be loaded: error #1088”. I saw the same issue were raised before and I followed sugestions but it does not work. Please help.
I followed this post: https://www.ads-software.com/support/topic/plugin-wordtube-task-queue-falled-at-step-5-playlist-could-not-be-loaded-error-1088?replies=6

https://www.ads-software.com/plugins/wordtube/