ORA-00936, ORA-936 is a generic error indicating a missing expression in the SQL statement that you have just executed. Most probably this error is indicating that you have either missed a , [ comma ] or the from clause or where clause or some other part of the SQL that has just been parsed.

ORA-00936:    missing expression

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ORA-00936 Cause:    A required part of a clause or expression has been omitted. For example, a SELECT statement may have been entered without a list of columns or expressions or with an incomplete expression. This message is also issued in cases where a reserved word is misused, as in SELECT TABLE.

ORA-00936 Action:    Check the statement syntax and specify the missing component.