I have my code developed in 2019 version and want to run it in the Orchestrator of version 2018

I have my code developed in 2019 version and want to run it in the Orchestrator of version 2018. It doesn’t run, i get the below error -

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@Mahalakshmi

Could you please delete project.json file and then open Main.xaml file and publish it.

Basically we are not recommending to do it .
Develop project from latest version and run through lower grade will make some error so you may have to correct all will take much time.
so its recommended to develop same version you wanna run.

and one of check step you can make by delete your project.json file (this file contain the relevant project versions and dependencies as you develop on 2019 version and after you delete it and run it on 2018 its will try to create it as per your running version)

its all correct and no issue hope you are lucky , if not you have to check the rest of relevant