latex: bibliography error

how to get the ieee bibliography template to work.

context:
ieee latex template for photonics journal using TeXworks editor.

procedure:

1. in file Optogenetics.tex: add "\cite{Deisseroth2006}" to random section.
2. in file Optogenetics.tex: define style and .bib file to the position where the references should be placed.
3. create file Optogenetics.bib with the following content:
4. execute.

error:
when adding references using ieee bibliography template, the following error occurs:

fix:
replaced procedure #2 with:
tried executing and it worked, .bib file loads perfectly. reverted to the code as written in procedure #2 (using IEEEtrans style) and the error no longer appeared, can't figure out why. i think it also helped that i restarted the editor but i'm not really sure.

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