It looks like your local orsmds store and your server's oramds store are out of sync.
To be sure, check the differences in WorkflowTask.xsd file at the following locations
Local machine --> "jdeveloper\integration\seed\soa\shared\workflow"
I am sure there must be a difference at the location mentioned in your original post.
You are right Vikrant.
The workflowType.xsd on server is not proper i.e. not as per the 126.96.36.199.0 version. How do I change the server version of it? The file on server has missing below elements for "systemAttributesType" element
<element name="imageUrl" type="xsd:string" minOccurs="0" maxOccurs="1"/>
This is really strange. I checked the SOA version, it is 188.8.131.52.0. Can you please guide me how to change the XSD from server?