Error on order review when paying via WPP

I am developing a site with recurring products and it gives me an error on order review:

Notice: Undefined index: amount in uc_recurring_hosted_paypal_wpp_process() (line 824 of /nfs/c04/h03/mnt/60223/domains/sitename.com/html/sites/all/modules/uc_recurring/modules/uc_recurring_hosted/uc_recurring_hosted.module).
Notice: Undefined index: data in uc_recurring_hosted_paypal_wpp_process() (line 825 of /nfs/c04/h03/mnt/60223/domains/sitename.com/html/sites/all/modules/uc_recurring/modules/uc_recurring_hosted/uc_recurring_hosted.module).
Notice: Undefined index: CURRENCYCODE in uc_recurring_hosted_paypal_wpp_process() (line 852 of /nfs/c04/h03/mnt/60223/domains/sitename.com/html/sites/all/modules/uc_recurring/modules/uc_recurring_hosted/uc_recurring_hosted.module).
Notice: Undefined property: stdClass::$rfid in uc_recurring_hosted_paypal_wpp_process() (line 865 of /nfs/c04/h03/mnt/60223/domains/sitename.com/html/sites/all/modules/uc_recurring/modules/uc_recurring_hosted/uc_recurring_hosted.module).
Notice: Undefined index: TRANSACTIONID in uc_recurring_hosted_paypal_wpp_process() (line 878 of /nfs/c04/h03/mnt/60223/domains/sitename.com/html/sites/all/modules/uc_recurring/modules/uc_recurring_hosted/uc_recurring_hosted.module).
PDOException: SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'txn_id' cannot be null: INSERT INTO {uc_payment_paypal_ipn} (order_id, txn_id, txn_type, mc_gross, status, receiver_email, payer_email, received) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5, :db_insert_placeholder_6, :db_insert_placeholder_7); Array ( [:db_insert_placeholder_0] => 75 [:db_insert_placeholder_1] => [:db_insert_placeholder_2] => web_accept [:db_insert_placeholder_3] => [:db_insert_placeholder_4] => Completed [:db_insert_placeholder_5] => [:db_insert_placeholder_6] => username@mail.ru [:db_insert_placeholder_7] => 1342195373 ) in uc_recurring_hosted_paypal_wpp_process() (line 886 of /nfs/c04/h03/mnt/60223/domains/sitename.com/html/sites/all/modules/uc_recurring/modules/uc_recurring_hosted/uc_recurring_hosted.module).

What can I do with this problem? The site is in final development stage and we need to finish it as soon as possible, please help!