Getting error 'contextPath needs to be an absolute path'

Error Description: 

While running a studio report that contains a sub-report and a logo in the subreport. When this report is published to JasperServer and run we get an error - 

 'contextPath needs to be an absolute path'

Solution: 

One possible reason for this error is, that the standard setup is to keep report resources like subreports and images in the JRS repository and not on the server filesystem. So when resources are kept in the FileSystem and not the repository this error is seen. 

To resolve this, we would need to add the subreport in the repository instead of the file system.