LyX ⇒ Error message from LYX everynow and then

[bossyu]

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:

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c^{*}=\left(\cfrac[r]{\varepsilon_{f}}{\sqrt{2}}\right)^{\nicefrac{1}{3}}\sqrt{\dfrac{E_{f}}{\rho_{f}}}=\left(\cfrac[r]{\varepsilon_{f}}{\sqrt{2}\rho_{f}}\right)^{\nicefrac{2}{3}}\left(\cfrac{E_{f}}{\rho_{f}}\right)^{\nicefrac{-1}{6}}

then press preview, the document will open. But the second I change the document to 1.5 spacing. this error meassage come out:

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!pdfTeX error: pdflatex (file yrcmex10): Font yrcmex10 at 600 not found.

I read this online but since I will dun understand how LyX work very well.. I have not idea how to fix the problem. i.e. where do I download the seemingly missing file. and which folder do I need to put the file in?

Many thanks

[bossyu]

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.

[bossyu]

Anyone have any idea?

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

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\sqrt{E_{f}/\rho_{f}}

[scottkosty]

Hi bossyu,

Your LyX document uses the package yhmath. You either have to install the yhmath bundle (which contains fonts and the LaTeX package) or stop using it. To stop using it, just go to Document > Settings > LaTeX preamble and remove "\usepackage{yhmath}"

See here:
http://www.ctan.org/pkg/yhmath

By the way, your file compiles fine for me without modification on Ubuntu with an updated TeX Live 2013. If you would like to install yhmath and if you are using Ubuntu let me know if you need more help. Otherwise I won't be able to help you.

[bossyu]

Thank you very much scottkosty,

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