Error occured on using custom visual with Report Server

[AndreyS]

Hi, I have a problem with using custom visuals on PBI Report Server. I made a custom visual and added it to my report, further a upload the report to corporate PBI Report Server, finally I open my report via web interface Report Server and there found broken custom visual I added (see image above).
Anyone are know how to solve this issue?

Thank you for help!

[AndreyS]

Additional information:

Power BI Report Server version: 1.3.6813.37954 (August 2018)

Custom Visual API version: 2.1.0