[biblio] Multiple author Error

[AKI]

I am getting error with my master thesis final draft !

I am using Ucalgary thesis class ! (Attached)

Problem comes when i use multiauthor like

@article{Schonewille02,

year = {2009},

author = {Schonewille, M and Klaedtke, A and Vigner, A and Brittan, J and
Martin, T},

journal = {First Break},

volume = {27},

pages = {85-92},

title = {Seismic data regularization with the anti-alias anti-leakage
Fourier transform},

}

Below is how i used in my tex file

 Parametric analysis based reconstruction methods are based on the \textit{a
priori} information from the seismic data alone \cite{Naghizadeh15}. Most
parametric reconstruction methods are based on Fourier transformation from
one domain to another \cite{Naghizadeh11, Naghizadeh12, Naghizadeh14}. In
the last few years excellent research is been done in this area \cite{Liu02,
Schonewille02}.The Prior assumption is either based on the stationarity of
the process or based on the fact that most of the power in the power
spectrum is concentrated on the lower frequencies, analysis based on this
fact known as bandlimitness \cite{Naghizadeh16}. Bandlimitness enforces only
the use of certain set of frequencies \cite{Feichtinger01}. These algorithms
perform efficiently even in situations where bandlimited assumption is not
satisfied exactly \cite{Trad03}.



Headers for my main thesis file are

\documentclass{ucalgthes} % Remove [includeprompt] to process all

%%% These are the packages I usually use. You can always add or take away
packages to make your life easier

\usepackage{graphicx}

\usepackage{amsmath}

\usepackage{url}

\usepackage{subfig}


\bibliography{references} %%% Use the name of your bib file

\bibliographystyle{crewes}

using natbib package in starting giving me error .attach is the log file

Thanks

kk
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