From the XML::Simple docs on importing ':strict':

the following common mistakes will be detected
and treated as fatal errors:

Failing to explicitly set the KeyAttr option - if you
can't be bothered reading about this option, turn it off
with: KeyAttr => []
...
[download]

It's not the forcearray that's giving you the problem, its the lack of KeyAttr.

Also note that you don't need two 'use XML::Simple' lines. One is plenty.