当我尝试使用添加引用时
\bibliographystyle{elsarticle-num}
\bibliography{mybib2}
它给出错误
> \bibdata{mybib2}
(./elsarticle-template-paper1.bbl
! LaTeX Error: Missing \begin{document}.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...
l.1 \begin{thebibliography}{}
You're in trouble here. Try typing <return> to proceed.
If that doesn't work, type X <return> to quit.
! LaTeX Error: Missing \begin{document}.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...
l.1 \begin{thebibliography}{}
You're in trouble here. Try typing <return> to proceed.
If that doesn't work, type X <return> to quit.
LaTeX Font Info: External font `cmex10' loaded for size
(Font) <12> on input line 1.
LaTeX Font Info: External font `cmex10' loaded for size
(Font) <8> on input line 1.
LaTeX Font Info: External font `cmex10' loaded for size
(Font) <6> on input line 1.
! Undefined control sequence.
该.bbl文件是在 Tex Studio 中创建的，并且是：
@article{dds2016,
title={Semantics-based },
author={Das, Yang and Zhang},
journal={IEEE transactions on information forensics and security},
volume={11},
number={2},
pages={289--302},
year={2016},
publisher={IEEE}
}
如何解决这些错误？