Help with iOS CI setup on Mac

We are configuring a Mac mini Server to run as a CI server for iOS app. PLATFORM AND VERSION iOS SDKs: OS X 13F34, iOS 12H141 OS X 10.10.4(14E46),OS X Server 4.1(14s1092), Xcode6.4(6E35b) OS X Yosemite Version 10.10.4 We want to achieve the following: - iOS continuous integration by using OS X Server. - non admin user - non admin iOS developer account - git repository using bitbucket - using SSH key pair, check out the source code, share the scheme, commit and create a bot to do the continuous integration. PROBLEM Encountered We choose an iOS device to do the build. Currently build and archive is okay and by using analyze we did not find any issue. However, when starting an integration using the bot, the error message appears as following : Bot Issue: error. Build Service Error. Issue: The xcodebuild task completed with uncaught signal (status 15). Integration Number: 7. Integration URL: [login to view URL] Description: The xcodebuild task completed with uncaught signal (status 15) You should be able to help us correctly configure the setup with the following arrangement: 1. Work during weekdays, between SGT(+0800) 10:00-16:00 we will connect online. 2. Using google hangout, or other screen share to share screen 3. We will do the work on our end based on your advice 4. You will advise any step to get it to work or troubleshoot via chat In your bid please estimate how long you think you will take to complete the above. Payment will be release only upon completion of work. Sorry, we will not be able to pay if in the end you are not successful. Sorry, there is no upfront payment or milestone. Only bid if agree to above conditions.