Custom XPath Function not working - ORABPEL-09503 error

Question

I wrote a simple date conversion custom xpath function.
1. Implemented IXPathFunction as mentioned in Clemens and Antony Reynolds blog.
2. Also changed the xpath-functions.xml kept at C:\product\10.1.3.1\OracleAS_1\bpel\system\config\xpath-functions.xml and also at C:\product\10.1.3.1\OracleAS_1\bpel\domains\default\config\xpath-functions.xml (Not sure why this xml is in two places)
3. Placed my class file at C:\product\10.1.3.1\OracleAS_1\bpel\system\classes and also made a jar and placed in C:\product\10.1.3.1\OracleAS_1\j2ee\home\applib.
But when I run the process which uses this custom function, it is throwing the following error
<Faulthttp://schemas.xmlsoap.org/soap/envelope/>
<faultcode>env:Server</faultcode>
<faultstring>ORABPEL-09503 Invalid xpath expression. Error while parsing xpath expression "o2c:formatDateString('10/30/2007', 'MM/DD/yyyy', 'YYYY-MM-DD');", the reason is Error in expression: 'o2c:formatDateString('10/30/2007', 'MM/DD/yyyy', 'YYYY-MM-DD');'.. Please verify the xpath query "o2c:formatDateString('10/30/2007', 'MM/DD/yyyy', 'YYYY-MM-DD');" which is defined in BPEL process. </faultstring>
</Fault>
Can somebody help me to resolve this.

Answer 1

My bad. I had a semi-colon after the expression. Now I am getting a different error
<Faulthttp://schemas.xmlsoap.org/soap/envelope/>
<faultcode>env:Server</faultcode>
<faultstring>ORABPEL-09500 XPath expression failed to execute. Error while processing xpath expression, the expression is "o2c:formatDateString('10/30/2007', 'MM/DD/YYYY', 'YYYY-MM-DD')", the reason is FOTY0001: type error. Please verify the xpath query. </faultstring>
</Fault>