[ERROR] syntax error at end of input

Hello list,

I'm trying to execute the following sentences in a pl/pgsql function.
aNomeProcAudita and pTabAudit are both variables.

DROP FUNCTION IF EXISTS aNomeProcAudita;
DROP TRIGGER IF EXISTS 'Audita_' || pTabAudit || '_trigger';

When I try to create this function without these two sentences, everything
goes ok, however, when I've got these two sql senteces, I get the following
error:

ERROR: syntax error at end of input

Is there anything wrong with the code?

Thanks in advance,

Marcelo.