Oracle Message PLS-00561 - character set mismatch on value for parameter string

ERRORcharacter set mismatch on value for parameter string
CAUSEAn expression was used that contains an incorrect character set. The actual argument has a character set conflict. If a default argument value is being used, it might be in conflict with some actual argument that must have the same character set.
ACTIONAdjust the expression, using TRANSLATE(... USING ...) or change the character set.