Error while creating a blog

Hello,

I have a problem with my wordpress installation.

It is a multisite installation. I allow my users to create their own blogs. It was working ok but last few users gets this message:Table 'saharatr_test1.wp_17_fm_settings' doesn't exist. I get the email to my admin inbox that new site has been created but when I want access the site I get this message. Since then I cannot create blogs, nor do my users. However the number in the error message keeps changing.

Thanks,

Stuart