Hello， we develop the new plugin, which is working properly in Milestone Xprotect corporate 2019R3 and 2020 R2. Then we try it in 2020 R3, it shows error. you can check the attachments for details.

MIP
, , ,
1

error2
error2720×405 58.2 KB
error1
error1720×405 33.8 KB

2

Thank you for sharing your images but can you please explain how to reproduce the error to us for further investigation?

The second exception is a known issue, please see -

https://developer.milestonesys.com/s/article/exception-when-running-Smart-Client-from-Visual-Studio-with-smart-map