I get the error - Cannot read 'background' propery of undefined - in ArcGIS Experience Builder.

[HakanUygucgil]

Is there anyone who knows how to fix it?

[DavidMartinez]

Hi Hakan,

Can you provide some more details on how you were able to produce this?

Thanks,

David

[HakanUygucgil]

Hi David,

I don't know how I were able to produce this .  As I remember I open Experience Builder and create a new experience selecting one the templates, save and exit. When I open Experience Builder again after this I receive this error. And its going on. I cannot fix it. 

Thank you for your interest.

Hakan

[Randall_LewisHealth___Policy_F]

I am having very similar issues with Experience Builder. I have tried to open it with edge and firefox, but both continue to get the same error.