andriod ./gradlew build 提示.9 图片报错

:preBuild
:compileDebugNdk UP-TO-DATE
:preDebugBuild
:checkDebugManifest
:prepareDebugDependencies
:compileDebugAidl UP-TO-DATE
:compileDebugRenderscript UP-TO-DATE
:generateDebugBuildConfig UP-TO-DATE
:generateDebugAssets UP-TO-DATE
:mergeDebugAssets UP-TO-DATE
:generateDebugResValues UP-TO-DATE
:generateDebugResources UP-TO-DATE
:mergeDebugResources
ERROR: 9-patch image /root/workspace/ReinforceApk/res/drawable-hdpi/bg_tab_bottom_r_f1_1.9.png malformed.
Must have one-pixel frame that is either transparent or white.
Error: Failed to run command:
/root/revo/tools/SDK/build-tools/23.0.3/aapt s -i /root/workspace/ReinforceApk/res/drawable-hdpi/bg_tab_bottom_r_f1_1.9.png -o /root/workspace/ReinforceApk/build/intermediates/res/debug/drawable-hdpi-v4/bg_tab_bottom_r_f1_1.9.png
Error Code:
42
Output:
ERROR: 9-patch image /root/workspace/ReinforceApk/res/drawable-hdpi/bg_tab_bottom_r_f1_1.9.png malformed.
Must have one-pixel frame that is either transparent or white.

:mergeDebugResources FAILED
ERROR: 9-patch image /root/workspace/ReinforceApk/res/drawable/rb_sub_jian.9.png malformed.
Must have one-pixel frame that is either transparent or white.

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':mergeDebugResources'.
> Error: Failed to run command:
/root/revo/tools/SDK/build-tools/23.0.3/aapt s -i /root/workspace/ReinforceApk/res/drawable-hdpi/bg_tab_bottom_r_f1_1.9.png -o /root/workspace/ReinforceApk/build/intermediates/res/debug/drawable-hdpi-v4/bg_tab_bottom_r_f1_1.9.png
Error Code:
42
Output:
ERROR: 9-patch image /root/workspace/ReinforceApk/res/drawable-hdpi/bg_tab_bottom_r_f1_1.9.png malformed.
Must have one-pixel frame that is either transparent or white.