Dell switch sync config

Dell switch sync config

I just installed DeviceExpert and added some of our Dell switches to it. When I try to run the Sync Configuration for one of the switches it fails and shows this in the status window:
Entered into the enable login mode successfully. 
copy running-config startup-config 
Overwrite file [startup-config] ?[Yes/press any key for no]....

It needs a 'y' keypress to make it work but it does seem that it's being sent. Is there a way to fix this?

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