Template::Plugin::Class -- error with dynamic arg.

Using T::P::Class, if i say:
[% USE class = Class(myhash.$mykey) %] 

usiing a variable as argument and then call a method
with class
[% class.mymethod %]

in one template i get  this error:
undef error - Can't call method "accessor_classes"
without a package or object reference at
/usr/lib/perl5/site_perl/5.8.5/Template/Plugin/Class.pm
line 35.

.

while in another template with same USE statement.
it works. 

If i hardcode a the classname in the argument, it
works. 

Someone addressed this on Maypole and CDBI lists but
the problem  wasn't talked about unfortuneately. 

http://lists.netthink.co.uk/pipermail/maypole/2004-September/000688.html

Anyone know why this happens? 

thanks.

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