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The scanner engine/output can be used only by one application. If a second application is trying to access the scanner, while in use. The error message will come.
Please check if there are more applications running in background.
Usual MC9090 applications with scanner drivers are Telnet, Datawedge, Rapid Deployment and custom software.
Exit one of the application or try to exit all of them.
Start your scanning application again, no error should appear now.
I had the same problem and I did a cold boot and the wireless icon showed on on the 'desktop' and I was able to use it again.
to do a cold boot, turn off the unit, remove the battery, pull the trigger and hold the power button for 5 seconds or so, and put the battery back in.