Apparent PBase system problems should be directly reported via email to
support@PBase.com. Admittedly the response to such email is often disappointingly slow or non-existent, but there is no guarantee the staff looks at these forums at all, this is where we users try (indeed, struggle) to help each other.
I just minutes ago uploaded 5 or 6 images to one of my galleries without incident. I also can't say I have ever seen the specific error message you describe (but that doesn't mean you may not have seen it!) Were you uploading using the drag and drop editor and upload button, etc. or using something else? (Has what you attempted to do worked for you in the recent past?)
There's my 2ยข,
DaveT