GetVBucket throws not implemented exception.

From Q&A: http://www.couchbase.com/communities/jp/q-and-a/weird-error
Weird Error

Hi Everyone,

Thanks in advance for the help. I have been getting the following error periodically.

GetVBucket is implemented only for VBucketNodeLocator implementation of IMemcachedNodeLocator

I am using couchbase as a session state offload and a caching utility.

The conditions under which I was receiving this error are as follows:

Couchbase 2.5.1 enterprise.
2 node system
when I am calling the following method:

var answer = _couchBaseClient.KeyExists("Key_Name");

For some reason the KeyExists method throws this error.

I am running this code in a two IIS server environment. The error essentially prevents the site from being usable.

I was able to remove this error but one of the two ways (neither of which is preferable to me):

removing the use of the KeyExists method which I don't want to do.
remove 1 node of my 2 node setup which makes fail over not possible.....again something I don't want to do.

So my question(s) is:

What I am doing wrong?
Configuration Issue?
Not best practice?

Thanks,

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