Keyspace not found keyspace Ndata- cause: No bucket named Ndata

[
{
“code”: 12003,
“msg”: “Keyspace not found keyspace Ndata- cause: No bucket named Ndata”,
“query_from_user”: “SELECT * FROM Ndata;”
}
]

Why iam getting this error ? when the bucket password is removed then it is working fine.
Is there any solution for this? Iam using this with phpsdk.