Connecting Zoho CRM using Java(API METHOD: authentication token)

Connecting Zoho CRM using Java(API METHOD: authentication token)

Hai,

Now  i am using the authentication token for Connecting Zoho CRM using Java .... While using method to get the Authentication token it shows response as
# #Wed Jun 20 00:34:07 PDT 2012 CAUSE=EXCEEDED_MAXIMUM_ALLOWED_AUTHTOKENS 
RESULT=FALSE


For What ?  this cause happens .....