Internal service error when posting via WidgetMediatopicPost?

Question

Classmates

I'm trying to place a media topic on the user's page through a widget for publishing to the user's page from external applications. Received app approval. I'm trying to post a message with a photo through a widget - it redirects to the connect.ok.ru/dk page, but when you click "Publish", an error is returned when redirecting {"type":"error","code":1,"message":"Internal service error, please try again later"} and of course the post is not posted.
st.attachment = {"media":[{"type":"text","text":"Genetic-test"},{"type":"photo","list":[{"photoId":" 803786314965"}]}]} The
photo ID was taken when uploading the photo to the server and placing it in the group's album, which is available to everyone.
The publication using the text, links and topic passes.
What is the problem?