Some problem with biblatex

Question

I have some problem about use biblatex with my document. I add package like this:

\usepackage[
           backend = biber,
           bibencoding = utf8,
           sorting = ynt,
           maxcitenames = 3,
           style = numeric-comp,
           ]{biblatex}

\addbibresource{bibliography.bib}

And my bib file like this:

@article{Hankamer2007,
  title={Electron crystallography of membrane proteins},
  author={Hankamer, Ben and Glaeser, Robert and Stahlberg, Henning},
  journal={Journal of structural biology},
  volume={160},
  number={3},
  pages={263},
  year={2007},
  publisher={NIH Public Access}
}

@article{Weik2000,
  title={Specific chemical and structural damage to proteins produced by    synchrotron radiation},
  author={Weik, Martin and Ravelli, Raimond BG and Kryger, Gitay and  McSweeney, Sean and Raves, Maria L and Harel, Michal and Gros, Piet and Silman,  Israel and Kroon, Jan and Sussman, Joel L},
  journal={Proceedings of the National Academy of Sciences},
  volume={97},
  number={2},
  pages={623--628},
  year={2000},
  publisher={National Acad Sciences}
}

etc. I have 30 sources in my bib file. Everything was good and worked fine. But now I can't find a key-tips for the \cite{} command argument:

This is the first small trouble. Now, if I want to add the following source (e. g. 31, 32 etc.) and link to them, I'll get the bug after compilation:

I don't see the number of article in my source list :( How to fix it? Please, help.