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@stoogesfan87 Follow @BuZz's advice.
@mitu Thanks, that also was my first guess (although I mentioned it secondly ;) ), but the other options seemed probable, too.
@simondid Please do not post a support request without first reading and following the advice in https://retropie.org.uk/forum/topic/3/read-this-first
No idea what system you are on or anything else.
If you are running under X I assume you are running on a PC ? It needs to be launched attached to a TTY.