Not able to load data in couchbase

when i try to load a zip file in couchbase using cbdocloader, i am getting below error. However it creates a bucket but does not load the data.

i am using below command
cbdocloader -n localhost:8091 -u Administrator -p Winter@123 -b category -s 200 “C:\Program Files\Couchbase\Server\bin\DROP\Category.zip”

Traceback (most recent call last):
File “cbdocloader”, line 201, in
File “cbdocloader”, line 183, in main
File “cbdocloader”, line 111, in init_bucket
File “cbdocloader”, line 160, in bucket_exists
File “cluster_manager.pyc”, line 191, in list_buckets
TypeError: string indices must be integers

can somebody please help here?