Can't load the Update page in Admin

I need to update our Lucee version from 5.2.1.9 to the current version. I am trying to perform the update on our test/UAT server first before we do the production servers. However I am unable to get the Update screen to load in the admin (http://127.0.0.1:8888/lucee/admin/server.cfm?action=services.update)

ENVIRONMENT:
OS: Windows Server 2012 R2 (6:3) 64bit
RAM: 4 GB
Disk: 99 GB
Lucee: Lucee 5.2.1.9
Tomcat: Apach Tomcat/8.5.14
Java: 1.8.0_131 (Oracle Corporation) 64bit

Lucee 5.2.1.9 Error (expression)

Message
Lucee 5.2.1.9 Error (expression)
Message Can’t cast Complex Object Type Struct to String

Detail
Use Built-In-Function “serialize(Struct):String” to create a String from Struct

Stacktrace
The Error Occurred in
/admin/services.update.cfm: line 362
called from /admin/web.cfm: line 399
called from /admin/server.cfm: line 2

Java Stacktrace
lucee.runtime.exp.ExpressionException: Can’t cast Complex Object Type Struct to String
at lucee.runtime.type.util.StructSupport.castToString(StructSupport.java:188)
at lucee.runtime.op.Caster.toString(Caster.java:1879)
at services_update_cfm414$cf.call(/admin/services.update.cfm:362)
at lucee.runtime.PageContextImpl._doInclude(PageContextImpl.java:928)
at lucee.runtime.PageContextImpl._doInclude(PageContextImpl.java:842)
at lucee.runtime.PageContextImpl.doInclude(PageContextImpl.java:826)
at web_cfm$cf.call(/admin/web.cfm:399)
at lucee.runtime.PageContextImpl._doInclude(PageContextImpl.java:928)
at lucee.runtime.PageContextImpl._doInclude(PageContextImpl.java:842)
at lucee.runtime.PageContextImpl.doInclude(PageContextImpl.java:826)
at server_cfm$cf.call(/admin/server.cfm:2)
at lucee.runtime.PageContextImpl._doInclude(PageContextImpl.java:928)
at lucee.runtime.PageContextImpl._doInclude(PageContextImpl.java:842)
at lucee.runtime.listener.ModernAppListener._onRequest(ModernAppListener.java:224)
at lucee.runtime.listener.MixedAppListener.onRequest(MixedAppListener.java:43)
at lucee.runtime.PageContextImpl.execute(PageContextImpl.java:2408)
at lucee.runtime.PageContextImpl._execute(PageContextImpl.java:2398)
at lucee.runtime.PageContextImpl.executeCFML(PageContextImpl.java:2366)
at lucee.runtime.engine.Request.run(Request.java:34)

Timestamp
3/5/20 10:05:05 AM PST

Thanks.
John King

One additional note: I did try restarting Lucee and then trying again. Still receive the same error. All of the other pages in the Admin load and function properly.

Thanks.
John King

@John_King, This issue didn’t happen on the latest versions of Lucee releases. Another solution if you want to use the latest version means, just download the latest version of Lucee.jar from https://download.lucee.org/ and put a jar to under lib folder instead of the update through the admin. So, you can able to use the latest version.