getchunk problems using mysql 5.0

Hi all,
i just had to install the 5.0 version of mysql.
previously i used an old 3."something" (my server crashed so i dont
remember the precise version).
I used to access mysql database using asp scripts.
Now i have found problems when i do the following:

for each x in rs.fields
if(x.name <>"stringdata") then
response.write(x.value)
else
response.write(x.getChunk(1000)
endif


the problem occurs when i try to access x.getChunk(1000).
the error i have is
operation is not allowed in this context.

Nothing changed in my scripts just i am using mysql 5.0.
Any advice on how can i solve the problem?
Regards.
f.