Internal Error: Cache a negative for an uninitialized server negative cache

[#1]

Hey all! 

This is my first time writing on here!

I keep getting an error any time I try to use my lightroom sync: An internal error has occured: Attempting to cache a negative for an unintialized server negative cache. 

I'm not sure what this means or what I need to do to fix this?? Can anyone help me?? 

[#2]

Hey all! 

This is my first time writing on here!

I keep getting an error any time I try to use my lightroom sync: An internal error has occured: Attempting to cache a negative for an unintialized server negative cache. 

I'm not sure what this means or what I need to do to fix this?? Can anyone help me?? 

[#3]

Can you verify that error message, a screenshot would be very helpful.

and when you include an screenshot, DO NOT ATTACH IT, instead insert it