The FLI converters require pieces of compiled code known as FLI templates, and sometimes your delivered application will need extra templates not included in LispWorks as shipped.
The function start-collecting-template-info
throws away any information about FLI templates that has been collected. Call it when you want to start collecting to create a definitive set of template information.
LispWorks Foreign Language Interface User Guide and Reference Manual - 29 Sep 2017