JSON::ParserError in Spree::PaypalController#express (when i select the PayPal option)

[dblchu]

I get this error mesage when i select PayPal. Please, Is there something i'm not doing right?

757: unexpected token at '<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:cc="urn:ebay:apis:CoreComponentTypes" xmlns:wsu="http://schemas.xmlsoap.org/ws/2002/07/utility" xmlns:saml="urn:oasis:names:tc:SAML:1.0:assertion" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" xmlns:ebl="urn:ebay:apis:eBLBaseComponents" xmlns:wsse="http://schemas.xmlsoap.org/ws/2002/12/secext" xmlns:ns="urn:ebay:api:PayPalAPI">SOAP-ENV:Header<Security xmlns="http://schemas.xmlsoap.org/ws/2002/12/secext" xsi:type="wsse:SecurityType"></Security><RequesterCredentials xmlns="urn:ebay:api:PayPalAPI" xsi:type="ebl:CustomSecurityHeaderType"><Credentials xmlns="urn:ebay:apis:eBLBaseComponents" xsi:type="ebl:UserIdPasswordType"><Username xsi:type="xs:string">xxx</Username><Password xsi:type="xs:string">xxx</Password><Signature xsi:type="xs:string">xxx</Signature><Subject xsi:type="xs:string"></Subject></Credentials></RequesterCredentials>/SOAP-ENV:Header<SOAP-ENV:Body id="_0">SOAP-ENV:FaultSOAP-ENV:ClientTimeout processing request/SOAP-ENV:Fault/SOAP-ENV:Body/SOAP-ENV:Envelope'