Oracle Error Message
PLS-00371: at most one declaration for ‘string’ is permitted
Reason for the Error
A reference to an identifier was ambiguous because there were multiple declarations for the identifier. At most one local variable with a given identifier is permitted in the declarative part of a block, procedure, or function. At most one label with a given identifier may appear in a block.
Solution
Check the spelling of the identifier. If necessary, remove all but one declaration of the identifier.