Please check out the discussion in the Hash statement problem. thread. The basic problem is still that the %$hash_reference syntax (and
I think also the @$array_reference syntax) simply doesn't work (Update: within a hash/array slice expression as shown in the OP – thanks, choroba) from version 5.10.x (where x == 0, I think) onward.
Wherever you find if, you will have to change this syntax as has been noted elsewhere in this and the previous thread – or else get the maintainer(s) of the module(s) in question to change it, which is probably more trouble than just changing it yourself!