Is it essential to have same TwinCAT versions (XAE on Engineering PC) and (XAR on Runtime PC)?

Question

I have two PCs connected to each other in TwinCAT as shown in the picture.

But, I am facing an error when I try to activate the configuration. Error is shown in the picture.

There is a difference in the version of TwinCAT versions (XAE on Engineering PC) and (XAR on Runtime PC). As shown in the picture

Is this error due to the version difference or any other thing and is it necessary to have the same TwinCAT versions on both PCs.

For further reference, The compile outputs are added below.

Code Generation Output:

Code Publish Output

Code built Output

For the TcCOM there was no subfolder in it. The Picture is added below.

I hope this will help you understand the problem.

Answer 1

The versions of engineering and runtime don't have to be exactly the same but still have to match the following rules: Major-Release number have to match Minor-Release number can differ. But engineering has to be equal or higher than Runtime
Examples:
XAR 4024.10 -- XAE 4024.20 -- OK
XAR 4024.20 -- XAE 4024.10 -- nOK
XAR 4022.xx -- XAE 4024.xx -- nOK
Regarding the last example. If you want to work with the current version of the engineering and still need to be compatible to older runtime systems, there is a so called "Remote Manager" for each major release which can be downloaded from the beckhoff website. Further information: https://infosys.beckhoff.com/content/1033/tc3_remote_manager/index.html?id=1584127271344589360

Regarding your error message: This is not a thing of versions. It comes from your c++ module instance. Please have a look in the compile output and the error log or even better, post it here.
Please check under System/TcComModules/ClassFactories if the related checkbox of the classfactory of your module is set.