RobotStudio Error - "Resource is held by someone else..."

in RobotStudio
Hello,
I create an empty cell, load a robot, build system from layout and try to run a simple move program. When I write the program from the virtual Flex Pendant, the program runs, but when I try to write it in the RS RAPID Editor and hit Apply Changes to load them to the virtual controller, the following error occurs: Resource is held by someone else...
The detailed error:

I think is a matter of admin stuff... any ideas how to fix this? I am already running RS with administrator rights.
Thanks.
I create an empty cell, load a robot, build system from layout and try to run a simple move program. When I write the program from the virtual Flex Pendant, the program runs, but when I try to write it in the RS RAPID Editor and hit Apply Changes to load them to the virtual controller, the following error occurs: Resource is held by someone else...
The detailed error:

I think is a matter of admin stuff... any ideas how to fix this? I am already running RS with administrator rights.
Thanks.
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Knud Erik Lindberg
Jorgensen Engineering