Android Logcat Error

I am have issue with mt app on mobile devices but i cant seem to access the logcat file to see what the error is. I enter the command adb logcat and it get the following. Has anyone else ran into this error or know the fix or a work around?

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FIX: Open Task Manager, select ‘monitor’ process and click ‘End Process’ then re-run the command adb logcat. Logcat will now open.