Scripting new function with MultipleRingBuffer - ERROR 000732: Input Features: Dataset GPL0 does not exist or is not supported

[IsaacBoates]

I am writing an arcpy script that at one point uses MultipleRIngBuffer, and then modifies the attribute table of the features that are created.  I have created a GUI for the tool as a script in a toolbox.  The first parameter is the input feature class, which will be buffered and have its attribute table modified.  It is of "Feature Layer" type.

If I use the table of contents entry for the feature class which I wish to buffer, I get this error:

ERROR 000732: Input Features: Dataset GPL0 does not exist or is not supported

However, if I use the direct path to the feature class (i.e. through ArcCatalog), it works.

I am hoping to resolve this somehow because I want users to be able to drag and drop TOC entries into the GUI like they can with any other tool.

Thanks.

[IsaacBoates]

I also just noticed that for some reason, it seems to remove the feature class from the table of contents at some point when the script is running.

[IanMurray]

Could you post some of your code you are using?  Feature Layer is the correct parameter type you should be using for TOC Layers(as long as they are referencing a feature class of course), so not sure from what you've posted so far what the issue might be.

Also for posting code(saw another of your posts) see: https://community.esri.com/blogs/dan_patterson/2016/08/14/script-formatting 

Edit: grammar changes, I think faster than I type......