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Hey thanks for replying!

Yeah I actually installed that. When I started writing with lyx in hebrew it wouldn't preview, so someone told me to install this, and I did , and it worked. Then I wasn't happy with the outcome of my writing, then my friend told me about this module, Theorem AMS and I ...

Firstly , thanks for responding. I am pretty new at this, and I don't understand much. I attached the files. I hope I understood right what I had to do. I attached the lyx file and a word file that has the entire log.

Hope I have attached the necessary and the right files. Thank you.

I use LYX with Hebrew and English together, and I added Theorem AMS to the module but whenever I try to preview it gives this error in the picture.

Does anyone know what it is and what I can do?

Thank you.