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LaTeX error messages can sometimes be tricky to understand and fix. We've put together a list of common errors below, along with more information about what they mean and how to solve them.

Alignment

Double subscript

Missing Math mode characters

References

Labeling

Float specifiers

Undefined control sequences

File not found

Missing number/illegal units of measure

Environment undefined (missing package)

Underfull and overfull boxes

Although these warnings are not errors we list them here for convenience:

Other

Overleaf guides

LaTeX Basics

Mathematics

Figures and tables

References and Citations

Languages

Document structure

Formatting

Fonts

Presentations

Commands

Field specific

Class files

Advanced TeX/LaTeX