Hi Santosh,
Welcome to to Sailpoint Developers community - try adding this schema definition to your XML
<Schema aggregationType="group" descriptionAttribute="ROLE_NAME" displayAttribute="ORG_ROLE##ORG_NAME" identityAttribute="ORG_ROLE##ORG_NAME" instanceAttribute="" nativeObjectType="OrganizationRole" objectType="group">
<AttributeDefinition name="ORG_ROLE##ORG_NAME" type="string"/>
<AttributeDefinition name="ROLE_NAME" type="string"/>
<AttributeDefinition name="ASSOCIATED_SECURITY_GROUP" type="string"/>
<AttributeDefinition name="ORGANIZATION_NAME" type="string"/>
</Schema>