I like my Gimp and scripts to be minimal, thats why i have deleted most of the native patterns and gradients.
This causes the 'Plastic or Glass' script to produce an error.

I dont need any of the logo effects this script provides, all i want is the bare gloss effect without any of the decorational options.

Can somebody remove those Background options and the drophadow option for me, please ?

On the left is what the script looks like now, on the right is what i want it to look like.



Plastic or Glass for 2.8 can be found here:
viewtopic.php?f=9&t=5626

Plastic or Glass for 2.10 can be found here:
viewtopic.php?f=9&t=16815

I would just ignore the parts that you do not want to use now, and then if you ever want the other ones, they are available to you.

Edit the file, find the names of the removed patterns and gradients, and replace them by some that you kept. You can also pick up different default values for the parameters.