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PLS-00108:

declarative units must be a single variable declaration
Cause: While checking a declarative unit (a top-level declare block without the BEGIN...END), PL/SQL found that there was more than one item declared or that the item was not a variable declaration. A table is a common variable declaration at the unit level. To define a TABLE, compile a DECLARE compilation unit, but only one at a time is allowed.
Action: Declare variables in separate declarative units.