loop-aes-source can't be build by m-a

Binary package hint: loop-aes-source

After upgrading to Dapper I had to recompile loop-aes for the new kernel 2.6.15-23-386. So I downloaded the package, new kernel-sources und kernel-headers.

While builing the package with "m-a" occurs the following error-message:
--------------------------------------------------------------------------
/usr/share/modass/packages/generic.sh: line 70: debian/rules: Permission denied
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line 70 is the "$@" behind the last else:
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action () {
if [ "$VERBOSE" ] ; then
echo " $@" >&2
"$@"
elif [ "$DRYRUN" ] ; then
echo " $@" >&2
else
"$@"
fi
}
--------------------------------------------------------------------------

I tried to change the files /debian/rules (644) to (755) and also generic.sh (744) to (755). This did not help. I tried to run m-a from sudo and also root..