I can't share my screen with others (fault code: 0)

[bopst]

Can anybody help me with the problem mentionned above ? My knowledge of technical english is rather poor, please apologize. So, what happens is, that being a host in Zoom sessions, I have been unable to share my screen with my students. The system says : "Default Code : 0. Try again later" - so I did many times without being successful - ??