ERROR_invalid_redirect_uri when setting up zoho wordpress plugin

ERROR_invalid_redirect_uri when setting up zoho wordpress plugin

Hi all, i went through the steps to setting up the zoho wordrpess plugin. all pretty straight forward. when i click on authorize, i go to this page:

https://accounts.zoho.com/oauth/v2/auth?response_type=code&client_id=1000.VCF0VNQCVQV389688JXH2VTJNZMUWB&scope=VirtualOffice.messages.CREATE,VirtualOffice.accounts.READ&redirect_uri=http://sweetwaterurbanfarms.com/wp-admin/admin.php?page=zmail-integ-settings&prompt=consent&access_type=offline&state=b945f92176

and i get this error in the upper right of the page:

ERROR_invalid_redirect_uri

any help is much appreciated...

thanks!