11
getting closer!
So, it appears that it has been defined elsewhere as well.
Or that the that parameter has been defined for use in another argument earlier in the block, so now it gives you a redundant error as the block attempts to define that information and display it for a second time.
(I had a weather block that had this issue as it defined the current conditions for an echoed text statement, and for display of a picture....I duplicated the define line and added a number 2 to the end of it, and edited all of the templates and files for the module to include the second definition, and it eliminated the error)