Zoom Video Preview Client View Meeting SDK

Hello, i integrated the meeting sdk into my platform, and i have some problems.
1- On the preview before entering a webinar, the video preview returns an “Unkown error”, the audio preview works fine.
2- Gallery View and other ones are available only for the host, and i don’t have the option to choose from a participant view. I only have the option to set to full screen.
Here are some screenshots.

i Hope someone can answer me before it’s too late.