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Thank you very much scottkosty,

I have remove \usepackage{yhmath} from the document and it work fine now.

Anyone have any idea?

The error message come out also when I put square root, subscript, and fraction together in one formula. For example:

Also, this same message come out many time and then I need to fixed the difference equation. it is getting very annoying. if there is a way to fix the problem for permanently it would be great.

Hi all,
I have just start learning LyX and have no latex background. The document look very nice at first but there are some error message coming out every now and then.

I find then if I put this equation:

c^{*}=\left(\cfrac[r]{\varepsilon_{f}}{\sqrt{2}}\right)^{\nicefrac{1}{3}}\sqrt{\dfrac{E_{f ...