By syntax error, do you mean the following?

Constant(\N{LATIN CAPITAL LETTER E WITH ACUTE}ric) unknown: (possibly 
+a missing "use charnames ...") at - line 1, within string
Execution of - aborted due to compilation errors.
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If so, like the message says, it's because you need to add use charnames ':full';. If not, could you be more specific? Maybe your version of Perl predates \N{}?

PS — charnames will be loaded automatically when needed in 5.16.