[Android Software Development] crian:
i'm getting this error while recompiling an apk. how can i fix this?

I: Using Apktool 2.3.0
I: Checking whether sources has changed...
I: Smaling smali folder into classes.dex...
I: Checking whether resources has changed...
I: Building resources...
W: ERROR: 9-patch image /home/christian/Dokumente/OPSystemUI/res/drawable-mdpi/pip_dismiss_scrim.9.png malformed.
W: No marked region found along edge.
W: Found along left edge.
W: ERROR: Failure processing PNG image /home/christian/Dokumente/OPSystemUI/res/drawable-mdpi/pip_dismiss_scrim.9.png
W: ERROR: 9-patch image /home/christian/Dokumente/OPSystemUI/res/drawable-xhdpi/pip_dismiss_scrim.9.png malformed.
W: No marked region found along edge.
W: Found along left edge.
W: ERROR: 9-patch image /home/christian/Dokumente/OPSystemUI/res/drawable-hdpi/pip_dismiss_scrim.9.png malformed.
W: No marked region found along edge.
W: Found along left edge.
W: ERROR: Failure processing PNG image /home/christian/Dokumente/OPSystemUI/res/drawable-xhdpi/pip_dismiss_scrim.9.png
W: ERROR: Failure processing PNG image /home/christian/Dokumente/OPSystemUI/res/drawable-hdpi/pip_dismiss_scrim.9.png
W: ERROR: 9-patch image /home/christian/Dokumente/OPSystemUI/res/drawable-xxhdpi/pip_dismiss_scrim.9.png malformed.
W: No marked region found along edge.
W: Found along left edge.
W: ERROR: Failure processing PNG image /home/christian/Dokumente/OPSystemUI/res/drawable-xxhdpi/pip_dismiss_scrim.9.png
W: ERROR: 9-patch image /home/christian/Dokumente/OPSystemUI/res/drawable-xxxhdpi/pip_dismiss_scrim.9.png malformed.
W: No marked region found along edge.
W: Found along left edge.
W: ERROR: Failure processing PNG image /home/christian/Dokumente/OPSystemUI/res/drawable-xxxhdpi/pip_dismiss_scrim.9.png
Exception in thread "main" brut.androlib.AndrolibException: brut.androlib.AndrolibException: brut.common.BrutException: could not exec (exit code = 1): [/tmp/brut_util_Jar_7493013611306467421.tmp, p, --forced-package-id, 127, --min-sdk-version, 26, --target-sdk-version, 26, --version-code, 26, --version-name, 8.0.0, --no-version-vectors, -F, /tmp/APKTOOL24553112205291716.tmp, -0, arsc, -0, arsc, -I, /home/christian/.local/share/apktool/framework/1.apk, -S, /home/christian/Dokumente/OPSystemUI/res, -M, /home/christian/Dokumente/OPSystemUI/AndroidManifest.xml]
at brut.androlib.Androlib.buildResourcesFull(Androlib.java:485)
at brut.androlib.Androlib.buildResources(Androlib.java:419)
at brut.androlib.Androlib.build(Androlib.java:318)
at brut.androlib.Androlib.build(Androlib.java:270)
at brut.apktool.Main.cmdBuild(Main.java:224)
at brut.apktool.Main.main(Main.java:75)
Caused by: brut.androlib.AndrolibException: brut.common.BrutException: could not exec (exit code = 1): [/tmp/brut_util_Jar_7493013611306467421.tmp, p, --forced-package-id, 127, --min-sdk-version, 26, --target-sdk-version, 26, --version-code, 26, --version-name, 8.0.0, --no-version-vectors, -F, /tmp/APKTOOL24553112205291716.tmp, -0, arsc, -0, arsc, -I, /home/christian/.local/share/apktool/framework/1.apk, -S, /home/christian/Dokumente/OPSystemUI/res, -M, /home/christian/Dokumente/OPSystemUI/AndroidManifest.xml]
at brut.androlib.res.AndrolibResources.aaptPackage(AndrolibResources.java:454)
at brut.androlib.Androlib.buildResourcesFull(Androlib.java:471)
... 5 more
Caused by: brut.common.BrutException: could not exec (exit code = 1): [/tmp/brut_util_Jar_7493013611306467421.tmp, p, --forced-package-id, 127, --min-sdk-version, 26, --target-sdk-version, 26, --version-code, 26, --version-name, 8.0.0, --no-version-vectors, -F, /tmp/APKTOOL24553112205291716.tmp, -0, arsc, -0, arsc, -I, /home/christian/.local/share/apktool/framework/1.apk, -S, /home/christian/Dokumente/OPSystemUI/res, -M, /home/christian/Dokumente/OPSystemUI/AndroidManifest.xml]
at brut.util.OS.exec(OS.java:95)
at brut.androlib.res.AndrolibResources.aaptPackage(AndrolibResources.java:448)
... 6 more