Unfortunately this is due to a major fault on the Vstep server. I have been trying very hard to get someone to fix this problem but so far I am having no luck. I can only suggest that, if you have bought your game direct from Vstep, you contact the Company and ask for a refund of your money. This might just, I hope, provoke some kind of response.
I do regret this is such a problem, but I am unable to directly do anything to help as I am not part of Vstep, but merely a volunteer who tries to help. The CMM's are unable to accept good missions or reject bad ones for the same reason.
Regards,
Angus.