The “source” is a hackish approach, as it will potentially interrupt the normal workflow. I mentioned this assuming you are very familiar with R and our code is open.
You either use our web-based platform (primary), or try to use the standard R commands after proper installation of MetaboAnalystR package. Note our support for R is limited due to time.
Final note - troubleshooting requires reproducible example, not just the last error message. This is described clearly in our post guide.