Hello,
I've taught myself gimp over the last few months and have followed tutorials online which have been brilliant. I've just downloaded shapes path and it's sitting where it supposed to be and the drop down menu loads with all the different shapes. I'm trying to make a star but when i press ok, I get an error message below :
Error while executing script-fu-star-path:

Error: Procedure execution of gimp-image-undo-group-start failed on invalid input arguments: Procedure 'gimp-image-undo-group-start' has been called with an invalid ID for argument 'image'.
Most likely a plug-in is trying to work on an image that doesn't exist any longer.

In the star box, the top two boxes which say 'images' and 'drawable' are empty. Is this right?

I'm not a designer by profession, learned gimp out of necessity so i could design banners for my ecommerce website. Would appreciate some help because i don't think i'm going to be able to work it out on my own
Many thanks

What version of GIMP are you using?

Also, there are two scripts available, which one are you using? Sounds like the .7 version, which is the older of the two. The .91 version is newest and should be the one you are using. The .91 version doesn't have input boxes for image and drawable.

Also, people tend to download both, which causes problems. If you do have both scripts uploaded to your scripts folder, remove the .7 version and refresh GIMP.

If you get that squared away, read here about creating stars with this script:

viewtopic.php?f=11&t=1200&p=13668&hilit=shapes+path#p13668

Hi there,
thanks for coming back so quickly. I downloaded .91 yesterday. As far as I know i never had .7 loaded because the shapes page was non-existent until i downloaded .91. I can't find .7 in the program files anywhere so i'm not sure that this is the problem. What would it be called if not shapes-path in the program files?
thanks

To me you are getting an error because the script needs you have an image open ready to draw a shape onto and if the Image and Drawable selections are empty then you don't have an image open.

That said, mahvin's advice is good, assuming that we're talking about the same script. So my question has to be, where did you download the script from?

Kevin

ps. I was writing this when you replied...

You may need to close gimp and re-open it.

Here is an example of a star I made. I started with a 500px x 500px image and used these settings:

When discussing third-party scripts or plug-ins, it would be nice if somebody provided a link to that which is being discussed.

Yes here is mine - 0.91 version of the script.
Keep in mind that X= left or right on the image, and Y= up or down.So if you use 250.0 by 250.0 you want a 500x500 new document to start and run the filter on a transparent layer.This places the star exactly center on your image layer.
Settings


Results

It's always interesting, at least for me, to discover something totally new. I have never tried to use shapes path without an image open, so it never dawned on me that someone was attempting to do just that. So, after trying to use it without an image open, I now understand what the problem most likely is, (like you say). Now my curiosity wants to know why the author permitted this - or - if it's just a fluke of how the code permits something without it ever actually being intended by the author.

I haven't checked to see what version I have, but Kevin is correct about an image needing to be open before running the script. Running it by itself, without an open image, gives the error that Yappydog described. It works when an image is present but gives the following when there is no open image.

The problem stems from the menu command constraints used when the various functions are registered with GIMP's Procedural DataBase (PDB). The line after the copyright date in the 'script-fu-register' blocks should be "*" and not "". The asterisk indicates that any type of image is acceptable, but that an image is necessary. The empty quotes signify that no image is required; in which case the script will presumably create a new image, or perform operations that have nothing to do with images (for example, sort a palette or modify a brush).

The script's author should be forgiven, in my opinion, as this feature was not originally explained very well in the GIMP documentation (the original script is over six years old). I have made the same mistake in the past and no doubt there are scripts of mine being distributed which would exhibit the same misbehavior. Some more experienced GIMP users will recall the days when such "non-image" scripts were placed in the "Xtns" menu in the (now non-existent) Toolbox Menu, which made this distinction more clear, even if the availability of the commands were specified incorrectly within the script.

I see that error a lot and now i am glad to know how to fix it if needed.

Thanks Saulgoode.

I am wrong or this it is a fundementhal point, but would be no sufficent to modify the script so could create its own image , instead then edit as now the active layer ?

I ask because i can't see how that script can create a new image, users can't chose W and H and apparently the script will not detect automatically the right size of the new image
(here i may be wrong , i could not understand all part of the script, i just suppose the author didn't consider the possibility for the script to create a new image )

So in case what else may be needed to edit a similar script so can be image indipendent ?

I suppose right size of new image should be the size of what created by the script + a few px margin at the border,(maybe not needed but better few px free margin then few pixel badly cropped away) but i would have no idea on how to code this

I've written a few scripts and never knew this! We do indeed learn here!

I moved this topic to "Gimp Help" forum.

The thing is PC is that if you add the asteric between the quotes - the filter wont even be selectable in the menu list.
Then you have to add the drawable to get it to show.
It is a good thing to know.