qw($FindBin::Bin LIB) doesn't interpolate.  It's equivalent to ('$FindBin::Bin', 'LIB'), which means you specified the literal string '$FindBin::Bin' instead of the value of the variable.

You probably meant

use lib "$FindBin::Bin/LIB";
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presuming the LIB directory is a subdirectory of $FindBin::Bin (i.e. the directory from where script was invoked).

See also Quote and Quote-like Operators.