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My mod crashed on line 42 about "amount". All of ingredient have amount value, but the problem is there're a nil value. could anybody solve my coding problem. Thanks in advanced.

Ps. The line 42 problem is about "wr-beacon-3" ingredient & cost multiplier

You are looking at line 42 in the wrong file.

Fix the file at the top of the error message, prototypes/compatibility/bobs_modules.lua

Why second thread? viewtopic.php?t=128185

first lesson of codding, no screenshot of code

You obviously have a GitHub repo - just link to it and show the error message.
And yes, you are looking at the wrong file.