You need to include the line:

use system_mod_includes;
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at the head of the Utils.pm module. This will allow you to use both of these:

print Dumper(%HASH); 
print Data::Dumper::Dumper(%HASH);
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But note that print Data::Dumper(%HASH); is a syntax error: the module name is Data::Dumper, so if you want to specify the namespace explicitly when calling the Dumper function, the syntax has to be Data::Dumper::Dumper.

Hope that helps,