[SOLVED] 2 Error Warnings: JLIB_INSTALLER and _load 667

Hi, I receive some Error Warnings (backend and Frontend) and don´t know what they mean. See the pics attached.
Do I have to do something to solve this?
Kind Regards

I already downloaded the latest Warp version, if this helps.

The error depends on a non esisting K2 user.
Please go to your K2 articles and assign these article to an existing user like admin.

Hi, thank you very much. solved

Problem solved.