In Pega 26.1, Unable to open a portal in preview to add widgets or update dashboard. Getting this error: The channel '' is not compatible with React-based UI. Select a different channel or create a new one.

User Experience
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Unable to open a portal in preview to add widgets or update dashboard. Getting this error: The channel ‘’ is not compatible with React-based UI. Select a different channel or create a new one.

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Are there any custom components added to this portal? Any errors in the console? Could you please create a new portal and check if the problem exist?