Oracle - Error PLs-00103

Oracle Automation: SQL execution error, ORA-06550: line 1, column 156:
PLS-00103: Encountered the symbol ":" when expecting one of the following:

( - + case mod new not null others <an identifier>
<a double-quoted delimited-identifier> <a bind variable> avg
count current exists max min prior sql stddev sum variance
execute forall merge time timestamp interval date
<a string literal with character set specification>
<a number> <a single-quoted SQL string> pipe
The symbol "null was inserted before ":" to continue.

Al Ejecutar un procedimiento almacenado desde Visual Basic.

El Procedimiento lo tengo compilado correctamente.

Cualquier respuesta, se agradece, si es que la hay

¿Y qué estás poniendo en VB?

Revisa la cadena que estas armando ...

PLS-00103: found str but expected one of the following: str

Cause: This error message is from the parser. It found a token (language element) that is inappropriate in this context.

Action: Check previous tokens as well as the one given in the error message. The line and column numbers given in the error message refer to the end of the faulty language construct.