我的Jenkins构建失败，输出如下。它可以是什么？
14:27:19 [Info] Collecting info for testables... (2378 ms)
14:27:20 run-test HorizonTests.xctest (iphonesimulator7.1, application-test)
14:27:20 [Warning] Tried to install the test host app 'com.upc.h.UPCTV.development' but failed. (33 ms)
14:27:20 [Info] Preparing test environment failed; will retry 2 more times (0 ms)
14:27:21 [Warning] Tried to install the test host app 'com.upc.h.UPCTV.development' but failed. (31 ms)
14:27:21 [Info] Preparing test environment failed; will retry 1 more time (0 ms)
14:27:22 [Warning] Tried to install the test host app 'com.upc.horizon.UPCTV.development' but failed. (30 ms)
14:27:22 [Info] Preparing test environment failed. (0 ms)
14:27:32 -[TEST_BUNDLE FAILED_TO_START]