_BSMachError XCode 7 Beta

Although this problem seems to persist as a bug and will likely be fixed, it stems from the new App Transport Security that has been implemented in iOS 9.

If your application pulls data from a web server, in order to populate the View Controller that you will be presenting, you can resolve these errors by verifying/granting access to the particular site(s) you’re pulling from.

In order to address this you will add the following to your App’s .plist file:

• You may want to alter your ATS Exception Dictionary to fit your needs

  <key>NSAppTransportSecurity</key>
  <dict>
      <key>NSExceptionDomains</key>
      <dict>
          <key>testdomain.com</key>
          <dict>
              <key>NSIncludesSubdomains</key>
              <false/>
              <key>NSExceptionAllowsInsecureHTTPLoads</key>
              <false/>
              <key>NSExceptionRequiresForwardSecrecy</key>
              <true/>
              <key>NSExceptionMinimumTLSVersion</key>
              <string>TLSv1.2</string>
              <key>NSThirdPartyExceptionAllowsInsecureHTTPLoads</key>
              <false/>
              <key>NSThirdPartyExceptionRequiresForwardSecrecy</key>
              <true/>
              <key>NSThirdPartyExceptionMinimumTLSVersion</key>
              <string>TLSv1.2</string>
              <key>NSRequiresCertificateTransparency</key>
              <false/>
          </dict>
      </dict>
  </dict>
  

More details to this solution can be found here or here
The Apple Documentation for App Transport Security is worth reading too.