error #6303: The assignment operation or the binary expression operation is invalid for the data types of the two operands

Hi All

EXEC SQL BEGIN DECLARE SECTION
CHARACTER*(*) X
EXEC SQL END DECLARE SECTION
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When I try to precompile the above code block I am getting

INTEGER*8 SQLITR
INTEGER*8 SQHSTV(1)
INTEGER*8 SQHSTL(1)
INTEGER*8 SQINDV(1)
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C EXEC SQL BEGIN DECLARE SECTION
CHARACTER*(*) OAUID
C EXEC SQL END DECLARE SECTION
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CALL SQLADR(X, SQHSTV(1))
SQHSTL(1) = (X)
SQINDV(1) = 0
SQHARM(1) = 0
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But in compilation it shows **The assignment operation or the binary expression operation is invalid for the data types of the two operands. [X]** error.Please guide me to solve this issue.