Hovering the mouse over the information icon ("i") in the QMC > Apps tab with Error in the Status column displays the message No Worker Scheduler found.
A review of the System_Scheduler log returns the below messages and errors:
Slave-node <FQDN of worker node> cannot run task Manually triggered reload of <app name>. Message: No ServerNodeConfigurations found in load balancing rules for App (name/id) <app name>/<app ID>
Could not reserve an executor for task: No node found for task(name/id) Manually triggered reload of <app name>/<app ID>
Environment
Qlik Sense Enterprise on Windows
A misconfigured Load Balancing rule governing the app and/or misconfigured Custom Properties associated with the app.
Resolution:
Review the Load Balancer rule/Custom properties associated with the app and resolve any misconfigurations.
For more information on Load balancing rules see Load balancing rules