In what circumstances do you want to predict expression level? (i.e. what information do you have?) I would think this would be rather difficult to do in any general sense..

The tag "software error" is unrelated to this question. Please use appropriate, relevant tags. Also, I'd recommend against terms like "buddy"; just stick to casual greetings like "Hi" or "Hello".

See these two links:

https://www.researchgate.net/post/Is_there_any_software_to_predict_protein_expression_value

See Daniel answer there - translation initiation rate

https://salislab.net/software/reverse

https://academic.oup.com/bioinformatics/article/25/17/2200/211163

These people estimated protein solubility from sequence

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