Contrary to the example you gave previously, you now seem to have the two snippets in question in different files. Which means that they don't share a lexical scope. So my explanation with lexical aliases doesn't apply in the new case.

A lesson you can learn from is that it's not efficient to ask very general questions first, if you really want to solve a specific problem; neither is asking a question that doesn't actually demonstrate the problem.

To answer your question, you need to either declare a lexical alias in each scope, to the same variable in the same package, or you need to qualify the namespace in one of the locations:

{
    our $ERRORFILE = 'foo';
}
{
    package RecordError;
    print $main::ERRORFILE, "\n";

}
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