Roku Developer Program

[Shishupal1]

I have a Roku Channel, it has live as well as non-live content, content is playing well for most of the Roku Devices but on Roku Ultra it's failing.

I am experiencing the following error:

<Component: roAssociativeArray> = 
{
  code: -6 
  message: "buffer:loop:unset:DRM exception: processLicense: [sess.lic.rep] KeyAdd failed : 99999(Cdm::kUnexpectedError):extra:etype:buffer"
} 

Can anyone help me on this issue?

I looked over the internet for many threads but non was helpful for my case.