ios - unexpectedly found nil while unwrapping an Optional value in webservice code -

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i have binded login action , tried call restfull webservice. enter image description here

below code:

 @ibaction func loginaction(sender: anyobject) {      println(emailtextfield.text)     println(pwdtextfield.text)    let plaindata = emailtextfield.text.datausingencoding(nsutf8stringencoding)   let base64string = plaindata?.base64encodedstringwithoptions(.allzeros)   println(base64string)      let plaindatapwd = pwdtextfield.text.datausingencoding(nsutf8stringencoding)     let base64stringpwd = plaindatapwd?.base64encodedstringwithoptions(.allzeros)     println(base64stringpwd)     var urlpath = "http://inspect.dev.cbre.eu/syncservices/api/jobmanagement/pluscontactauthentication?email=\(base64string)&userpwd=\(base64stringpwd)"       var url: nsurl! = nsurl(string: urlpath)      var request: nsurlrequest = nsurlrequest(url: url)     var connection: nsurlconnection! = nsurlconnection(request: request,         delegate: self,startimmediately: false)      connection.start() }

i found nil while unwrapping optional value in webservice

try code:

  @ibaction func login(sender: anyobject) {      println(txt1.text)     println(txt2.text)     let base64string : nsstring = ""     let base64stringpwd : nsstring = ""      if let plaindata = txt1.text.datausingencoding(nsutf8stringencoding){      let base64string = plaindata.base64encodedstringwithoptions(.allzeros)     println(base64string)      }      if  let plaindatapwd = txt2.text.datausingencoding(nsutf8stringencoding){     let base64stringpwd = plaindatapwd.base64encodedstringwithoptions(.allzeros)     println(base64stringpwd)      }      var urlpath : nsstring? = "http://inspect.dev.cbre.eu/syncservices/api/jobmanagement/pluscontactauthentication?email=\(base64string)&userpwd=\(base64stringpwd)"      var url = nsurl(string: urlpath!)     if let url1 = url{          var request: nsurlrequest = nsurlrequest(url: url1)         var connection: nsurlconnection! = nsurlconnection(request: request,             delegate: self,startimmediately: false)         connection.start()         }      } }

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