Membership 3.0 - error

I have just upgraded to the new Membership plugin and have come across an error which I need help in fixing.

Step by step guide to what I did:

1- Upgraded
2- Network activated
3 - Started with the wizard, set up two levels
4 - Selected Paypal single payments as the payment gateway

then I got this error Fatal error: Cannot redeclare class paypalsolo in /home/ilovehan/public_html/wp-content/plugins/membership/membershipincludes/gateways/gateway.paypalsolo.php on line 579

Now I cannot access any of my admin or even the front site.