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Hi Stefan_k,

Yes, that is correct - I was referring to Johannes comment. I did exactly as Johannes and yours description; I downloaded the undertilde.ins and undertilde.dtx files then I put the both files in the same folder as my lyx.file. Futher, I also comment out the undertilde package in lyx ...

Thanks but it simply doesn't work. I don't know exactly how to continue with this problem.

Hi again,

Sorry for the delay answer I sort of postponed. Before going with details of my problem. The lyx.file that I am working on, I can compile it without any problem on windows however using lyx on mac OSX seem to causing me huge problem which I did not confront before.
I typed a new ...

Hi,

Thanks for the quick reply! I am assuming that I need the package ´undertilde´ package because I keep getting the error. How can I find out whether one need the package or not?

I have written the two following packages in the tab documents--preferences--latex preamble without any luck ...

Hi,

I am relatively new in using Lyx in Mac OS X. I keep getting an error message which I don't understand how to solve, even though I have searched for the problem and found some solutions on the web but it doesn't seem to be working. I would really appreciate if anyone can help me out!!

xetex ...