It is likely that you are using LC Designer specific JS. Acrobat JS and LC Designer JS are different with the exception of a very few methods, and properties.
This is the top portion of the script that I copied.
//@@SUBMITURL "mailto:firstname.lastname@example.org?subject=Submitting Completed Form&body=Instructions to add this form to a responses file:\n1. Double-click the attachment.\n2. Acrobat will prompt you to select a responses file.&ui=false"
The scripting languages are very different between Acrobat and LiveCycle just like the format of the content is radically different. There is very little code that can be copied between the products. I would seriously consider rewriting the script for your Acrobat form.
You should be aware that the 2 products Acrobat by Adobe and JetForms by JetForms, later purchased by Adobe and renamed to LiveCycle, were developed at approximately the same time and because they used different technology approaches there were no patent infringements. In fact the only similarity is how the user views the form and the form act while in the PDF format.
Unless you are writing functions that only use values or passed object names, your most likely will not be able to copy the code form one format to the other.