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SDL Trados Studio 2019 worked one day, then it stopped.

I have downloaded SDL Trados Studio 2019 and for the first day it worked.  Since then, I have been unable to do anything.  Whenever I try to confirm or save a translation, I get the error message ¨Object reference not set to an instance of an object.¨ I basically can´t do anything with this program.  I am using Windows and would like to get some help so I can use this program the right way. What should I do?