llSetPrimitiveParams error (non-integer rule) when using llCSV2List

So to show what my problem is, here is some code:

string listing = llList2CSV(GetPrimitiveParams([PRIM_TYPE]));

llSetPrimitiveParams(GetPrimitiveParams([PRIM_TYPE])); //Works just fine

llSetPrimitiveParams(llCSV2List(listing)); //ERROR: llSetPrimitiveParams error running rule #1: non-integer rule.

Now, no matter how I try and output this, the end result looks the same to me. I'm not sure what the difference is.

oh, the method GetPrimitiveParams comes from the bottom of http://secondlife.com/badgeo/wakka.php?wakka=llGetPrimitiveParams rather then the default.

When you convert a list to a string using llList2CVS you lose the variable types, these are very important to the llSetPrimitiveParam function. Instead use the function on the following page:

http://secondlife.com/badgeo/wakka.php?wakka=ExampleListConversion

Works a treat, takes your list and checks each element of the list for it's type and sends that as a 'note', when converting back to a list it reads each 'note' and applies an (integer)llList2String or (float)llList2String etc.

The alternative would be to use the actual integer values, so you can type cast them easily. Rather than PRIM_TYPE you put in a 9, it makes the conversions easier too.

dont use CSV use llParseString2List

it allows you to use whatever seperator you want ie using | as the seperator
"data|<0.00001,0.00002,0.000003>|59"

would come out to be ...
list whatever =["data","<0.00001,0.00002,0.00003>","59"]
use List2String and typecasting

here is the wiki page for phrase string to list ...
http://secondlife.com/badgeo/wakka.php?wakka=llParseString2List

and here is a basic example, written a cupple days ago for something similar ...
/54/e1/123970/1.html#post1171931

Thank you everyone, I used nand's solution and it worked great. I just replaced my list2csv commands and my whole project worked