The code you show has backslashes (\( and \)) but the error message shows forward slashes (/( and /)). Regardless, the code you need has two backslashes (in each position):

$ perl -Mstrict -Mwarnings -e '
print `find . -type f \\( -perm -0020 -o -perm -0004 -o -perm -0002 -o
+ -perm -0001 -o -perm -1000 \\) -ls`;'
... ls listing here ...
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