Connection lost evey 30 seconds, execution cancelled, robot unavailable

[ekaraoglu (Elif Karaoğlu)]

Execution has been cancelled

I have an issue. I start Level 3 advanced calculate security hash project. When i run the project a few second later i have this error: [Screenshot_14] How can i fix this problem? Maybe it is because of new version of uipath. My uipath version is 2019.2.0 Enterprise Edition.