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在 travisci 上运行我的构建时，由于 gradlew 文件的权限被拒绝，它似乎失败了。我怎样才能解决这个问题？这是 Travis-ci.org 上的内容:
$ java -Xmx32m -version
java version "1.7.0_76"
Java(TM) SE Runtime Environment (build 1.7.0_76-b13)
Java HotSpot(TM) 64-Bit Server VM (build 24.76-b04, mixed mode)
$ javac -J-Xmx32m -version
javac 1.7.0_76
0.00s$ ./gradlew build connectedCheck
/home/travis/build.sh: line 45: ./gradlew: Permission denied
The command "./gradlew build connectedCheck" exited with 126.
Done. Your build exited with 1.