Object reference not set to an instance of an object

Question

I use Studio 2015 and this error message appears quite often. I tried to reset the the window layout & to delete the xml files from C:\Users\Your username\AppData\Roaming\SDL\SDL Trados Studio\11.0.0.0 as Jerzy suggested, but it helped just for a while. I also repaired the installation. But with no effect. When this message appears, I have to restart Studio to continue working. I did reorganize my TM&acute;s too. 
 Any ideas what could cause this problem? Thank you!

Paul · Answer

Hi Adrian, 
 
Can I just double check that you tried renaming this location? 
 
C:\Users\Your username\AppData\Roaming\SDL\SDL Trados Studio\12.0.0.0 
 
Call it this and restart Studio: 
 
C:\Users\Your username\AppData\Roaming\SDL\SDL Trados Studio\12.0.0.0_old 
 
Note this is 12 and not 11 which was Studio 2014. 
 
Regards 
 
Paul

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Object reference not set to an instance of an object