Error message for the buffer tool

Discussion created by Shiko on Jun 25, 2013
Latest reply on Jun 25, 2013 by csny490
Hi folks
I'm having issues troubleshooting an error message while trying to set my buffer parameters.

The intention is to create a selection criteria on an ArcGIS Map to generate areas that are 1000 feet around any major roads.
I have already defined roads as a variable, and the following is the tool parameter that I'm trying to input, which sets the optional dissolve parameter to ALL , so that overlapping buffers are dissolved:

buffer = arcpy.Buffer_analysis(roads, "in_memory/buffer", "1000 Feet", "", "", "ALL")

Now I keep getting an error message with the word buffer highlighted but I don't know what's wrong. Also, as I type the word buffer in the IDLE screen it turns purple. Does this mean it has some kind of internal definition or something?