Waiting time when starting new tasks due to lack of resources

What causes this issue?

No tasks could be started in parallel processing as no system resources
are presently available.

System Response

If low resources are reporting by the parallel processing environment,
the system will try to trigger processing again after waiting for 10
seconds. The system will attempt to start the process ten times. If
still no resources are available after these attempts, processing is
cancelled.
Processing status: &V1&.
Number of attempts made to start the process: &V2&.

How to fix this error?

This is an information message.

Procedure for System Administrators

If you receive this mail regularly, your system may suffer from a
general resource problem. If this is the case, you should have your
system check and the resource problem solved.

Error message extract from SAP system. Copyright SAP SE.