Deployment automation issue (via compare and deploy to other environment)

Question

Dear All, 
 
 We have a requirement to setup a new Dev environment (v20.2) .We have more than 50 + application to export from old env into new environment. 
 
 Some of the applications (contains 1000+ objects). When we try deploying via compare and deploy option . The system throws with 500 error as below 
 HTTP Code: 500 APNX-1-4198-000 
 Error Evaluating UI Expression Expression evaluation error [evaluation ID = YU5ZGJIV] : [valid:false,syntaxError:false,value:Expression evaluation error: An error occurred while executing a save: Expression evaluation error at function a!dod_api_app_checkResult [line 66]: The specified environment is not available] 
 Any suggestion/Steps or best practices to import large application which contain more than 1000 objects ? Anybody faced similar issues.Please help

GopalK · Answer

Hi ,Even i have faced this challenge , It happens if your app has lot of objects and you try to deploy them into another environment using compare and deploy. As Peter already suggested that , export the whole app and then import into another environment. It worked for me as well and meanwhile you can raise a ticket with Appian Support team.