Just to clarify ikegami's response: The command line tells perl that you want version 999 of the module in question. When perl can't find that version, it reports the version you do have:

$ perl -e 'use Spreadsheet::ParseExcel 999'
Spreadsheet::ParseExcel version 999 required--this is only version 0.5
+7 at -e line 1.
BEGIN failed--compilation aborted at -e line 1.
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(I didn't recognize what the command line was doing until I executed it to see the error message. I knew you could specify the version on the use line, but thought there was more syntax to it.)

...roboticus

When your only tool is a hammer, all problems look like your thumb.