Can someone explain this warning message?

I would like to know why this warning message appears? JUser: :_load: Unable to load user with ID: 52

It appears in the back-end of Joomla 3.4.8 with jux_charity_hub 1.0.2. I and it appears when a try to edit a CAUSE by going to COMPONENTS / JUX CHARITY HUB / CAUSES .

What is the meaning of this warning message? What causes the message to appear and how can it be fixed?

Thank you for your help!

I found the answer to my question. Here

HI Esau Meza,
Thank you!