I have a DTML method, category_list_cookie, which returns a string of colon-separated values I use elsewhere. I would like to split this into a list so I can use something like phred.count('whatever') to see if this value is present. However, when I do something like: <dtml-with "_.namespace(var1=_.string.split(category_list_cookie, ':'))"> I get this error: Error Type: TypeError Error Value: argument 1: expected read-only character buffer, ImplicitAcquirerWrapper found Even with something like this: <dtml-with "_.namespace(var1=category_list_cookie)"> <dtml-call "REQUEST.set('var2', _.string.split(var1, ':'))"> the split method gives the same error. Is var1 in the second example merely a reference to category_list_cookie, so that I get the same error? Whether or not this is the case, what does the error mean and how do I fix it? Cheers, Jim