A question about exporting step file

[icjking]

Dear all：
I have a question about exporting step file.
I called the GH file by computing service（https://developer.rhino3d.com/guides/#compute）,
but I could not export the STEP format using the LunchBox save Object plugin .
While I can export STEP format using the same plugin by openning grasshopper software.
could you tell me the right way to call GH file by computing service?
I look forward to your reply as soon as possible.
Thank you very much.