GitHub user GerorgeEG edited a discussion: DRS status page is blank for cluster 
in ACS 4.20.2.0

### problem

We have DRS enabled for cluster and it is also migrating the VM's as per the 
set configuration. But when we got to DRS tab in the cluster settings , its 
status page is showing blanked. Below is the screenshot

<img width="1338" height="507" alt="Image" 
src="https://github.com/user-attachments/assets/78409763-d32a-4a73-97bd-a61ec93bc5b3";
 />

<img width="872" height="274" alt="Image" 
src="https://github.com/user-attachments/assets/a5daa54b-84b2-42d0-8ebd-9ef40cc7b152";
 />

Logs in management server when we are trying to get the details
==========
**2026-06-19 12:54:08,481 ERROR [c.c.a.ApiServer] 
(qtp253011924-8461:[ctx-aaf556dd, ctx-bdf2c1bf]) (logid:eb42248f) unhandled 
exception executing api command: [Ljava.lang.String;@284b219 
java.lang.NullPointerException: Cannot invoke 
"com.cloud.event.EventVO.getUuid()" because "event" is null
        at 
org.apache.cloudstack.cluster.ClusterDrsServiceImpl.listDrsPlan(ClusterDrsServiceImpl.java:836)**
        at 
org.apache.cloudstack.api.command.admin.cluster.ListClusterDrsPlanCmd.execute(ListClusterDrsPlanCmd.java:57)
        at com.cloud.api.ApiDispatcher.dispatch(ApiDispatcher.java:173)
        at com.cloud.api.ApiServer.queueCommand(ApiServer.java:830)
        at com.cloud.api.ApiServer.handleRequest(ApiServer.java:654)
        at com.cloud.api.ApiServlet.processRequestInContext(ApiServlet.java:351)
        at com.cloud.api.ApiServlet$1.run(ApiServlet.java:154)
        at 
org.apache.cloudstack.managed.context.impl.DefaultManagedContext$1.call(DefaultManagedContext.java:56)
        at 
org.apache.cloudstack.managed.context.impl.DefaultManagedContext.callWithContext(DefaultManagedContext.java:103)
        at 
org.apache.cloudstack.managed.context.impl.DefaultManagedContext.runWithContext(DefaultManagedContext.java:53)
        at com.cloud.api.ApiServlet.processRequest(ApiServlet.java:151)
        at com.cloud.api.ApiServlet.doGet(ApiServlet.java:105)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:645)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:750)
        at 
org.eclipse.jetty.servlet.ServletHolder$NotAsync.service(ServletHolder.java:1450)
        at 
org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:799)
        at 
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:554)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
        at 
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:600)
        at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:235)
        at 
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1624)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233)
        at 
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1440)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188)
        at 
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:505)
        at 
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1594)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186)
        at 
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1355)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
        at 
org.eclipse.jetty.server.handler.gzip.GzipHandler.handle(GzipHandler.java:772)
        at 
org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:146)
        at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
        at org.eclipse.jetty.server.Server.handle(Server.java:516)

### versions

ACS Version: 4.20.2.0 
DB : Maria DB 10.3.39
ACS and KVM host : RHEL 8

### The steps to reproduce the bug

1. Go to Cluster --> DRS tab
2. When try with api getting below error

list clusterdrsplan
🙈 Error: (HTTP 530, error code 9999) Cannot invoke 
"com.cloud.event.EventVO.getUuid()" because "event" is null
(acs-xxx-xxx) 🐱 > list clusterdrsplan 
clusterid=5501e4b4-2599-4f31-981a-130c28c61bab
🙈 Error: (HTTP 530, error code 9999) Cannot invoke 
"com.cloud.event.EventVO.getUuid()" because "event" is null
3.
...


### What to do about it?

_No response_

GitHub link: https://github.com/apache/cloudstack/discussions/13457

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