We usually ask people to contact the developers of the external tool directly. The support page for the Lipid Creator external tool is here:
If you post your question on that page, it will be the first question posted there. I do not know how quickly you will get a response, but it's always nice to start an active support community on the external tool support pages.
I can also take a look at the problem if you would like. I do not know how to use Lipid Creator so you would have to send me your files and tell me what you did so that I can reproduce the problem.
If your files are less than 50MB you can attach them to this support request. Otherwise you can upload them here: