Problem:
I have this problem. Before that pcmtuner worked fine. I have updated PCMflasher. After that, she does so. Error “Only One Instance At A Time”. Has anyone experienced this?
Solution:
pcmtuner app is already running in the back ground, go to task manager and maximise.
Check:
http://www.pcmtuner.org/pcmtuner-how-to-stop-pcmflash-updates/