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I'm really confused why this is happening in my file. This error have shown up right before I have finished my paper. And I have no clue of what is going on.

Source code & Message log

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    Welcome to TeX.SX! Please add code and log messages as copyable plain text and not as an image. Images are awkward to deal with, don't allow for copy-and-paste, are not indexed by search engines and pose accessibility problems for people with screen readers. Please have a look at tex.meta.stackexchange.com/q/228/35864 to find out about example documents, so-called MWEs, that make it easier to understand your question. – moewe Jan 20 at 22:25
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    The \elseo in the definition of \backrefalt looks like a typo. Do things work if you say \else instead? – moewe Jan 20 at 22:26
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    the form of the error message you show in red and in the title of your question is just a confusing "summary" of the error made by your editor, it is not TeX's error message and it does not show which command is undefined. The error log from tex at the bottom of your image shows that the the undefined command is \elseo which is presumably a typo for \else – David Carlisle Jan 20 at 22:41

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