Does it work fine after removing the initial duration of 1 week? It should be ok as their API supports 1 week duration for trial and regular pricing. If works fine with the week trial removed please try with the week added back in after making the below edit.
IN: components/com_comprofiler/plugin/user/plug_cbpaidsubscriptions/processors/paypalpro/cbpaidsubscriptions.paypalpro.php
ON: After Line 321
Code:
$requestParams['TRIALTOTALBILLINGCYCLES'] = 1;
Please also review the CBSubs history log for more details on the error.