Here is the entire code for my document:


When compiling, I get the error

! Missing number, treated as zero.

EDIT: Thanks to Marijn for help with formatting.

EDIT 2: Bonus points to whoever can reproduce the phantom character.


What's going on is that there's a phantom character between the { and the i, that's causing the code to not compile. I figured out that the character was there by pasting the code into Overleaf: it displayed the phantom character immediately.

I don't know where this character came from, and I don't know where it will go, but I figured I'd post here in case someone else is struggling with the same issue.

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