Microsoft Lync 2010 cannot get in the meeting

Hi experts,
When I want to connect to an online meeting I have the following error. I don’t have a solution for this and nothing that error say is not working. What steps should I follow to repair this ? What is wrong ?
Thank you experts !

Microsoft Lync 2010
Sorry, something went wrong, and we can’t get you in the meeting. It’s possible you’re using a bad URL. Try calling into the meeting using the phone number on the invite, or ask the organizer to drag you in.
