Hithere mate im having the same issue:
Signing APK...
Exception in thread "main" java.io.FileNotFoundException: APKs\Modified\blackboxtv.apk (El sistema no puede encontrar el archivo especificado)
it seems the software is not finding the folder i double check and is there, but is savind the decompiled correct, is just when it try to save the app that is not working saving to the Modified folder
update: i thing is something wrong with the app and the apkeditor is not compiling the apk and thats why is not saving it:
Recompiling to APK...
I: Using Apktool 2.7.0
I: Smaling smali folder into classes.dex...
I: Smaling smali_classes2 folder into classes2.dex...
I: Building resources...
W: Failed to generate resource table for split ''
W: C:\Users\Usuario\Downloads\APPSNSCRIPT 2024\XC-Auto\XC-Auto\APKs\Decompiled\xc-2\res\values-v31\colors.xml:55: error: Error: Resource is not public. (at 'm3_ref_palette_dynamic_tertiary0' with value '@android:color/Indigo_800').
W:
brut.androlib.AndrolibException: brut.common.BrutException: could not exec (exit code = 1): [C:\Users\Usuario\AppData\Local\Temp\brut_util_Jar_80745176785011306282945872401233825491.tmp, p, --forced-package-id, 127, --min-sdk-version, 21, --target-sdk-version, 33, --version-code, 803, --version-name, 6.0, --no-version-vectors, -F, C:\Users\Usuario\AppData\Local\Temp\APKTOOL10807999890110188704.tmp, -e, C:\Users\Usuario\AppData\Local\Temp\APKTOOL15251979639747324075.tmp, -0, arsc, -I, C:\Users\Usuario\AppData\Local\apktool\framework\1.apk, -S, C:\Users\Usuario\Downloads\APPSNSCRIPT 2024\XC-Auto\XC-Auto\APKs\Decompiled\xc-2\res, -M, C:\Users\Usuario\Downloads\APPSNSCRIPT 2024\XC-Auto\XC-Auto\APKs\Decompiled\xc-2\AndroidManifest.xml]
Recompiling complete
Zipaligning APK...
Unable to open 'APKs\Modified\blackboxtv.apk' as zip archive
El sistema no puede encontrar el archivo especificado.
Zipaligning complete
Signing APK...
Exception in thread "main" java.io.FileNotFoundException: APKs\Modified\blackboxtv.apk (El sistema no puede encontrar el archivo especificado)
at java.base/java.io.RandomAccessFile.open0(Native Method)
at java.base/java.io.RandomAccessFile.open(RandomAccessFile.java:356)
at java.base/java.io.RandomAccessFile.<init>(RandomAccessFile.java:273)
at java.base/java.io.RandomAccessFile.<init>(RandomAccessFile.java:223)
at com.android.apksig.ApkSigner.sign(ApkSigner.java:190)
at com.android.apksigner.ApkSignerTool.sign(ApkSignerTool.java:371)
at com.android.apksigner.ApkSignerTool.main(ApkSignerTool.java:88)
Signing complete