error after dex2jar - java.lang.StringIndexOutOfBoundsException:

The error appears during the dex2jar decompiling of the apk. Then it proceeds to show only partial decompiled code. Some classes are still not showing. Any suggestions?

https://the.bytecode.club - Created by @Konloch - Bytecode Viewer 2.9.22, Fat-Jar: true
Start up took 0 seconds
I: Using Apktool 2.3.0 on WYhdEGYwnGvNUsjsjfnQzjiPBsTgwUTY.apk
I: Loading resource table...
I: Decoding AndroidManifest.xml with resources...
I: Loading resource table from file: /root/.Bytecode-Viewer/bcv_temp/vehRXjxUsrFA/1.apk
I: Regular manifest package...
I: Decoding file-resources...
S: Could not decode file, replacing by FALSE value: font/gt_eesti_display_regular.ttf
S: Could not decode file, replacing by FALSE value: font/gt_eesti_display_bold.ttf
S: Could not decode file, replacing by FALSE value: font/gt_eesti_text_regular.ttf
S: Could not decode file, replacing by FALSE value: font/gt_eesti_text_bold.ttf
I: Decoding values */* XMLs...
I: Baksmaling classes.dex...
I: Baksmaling classes2.dex...
I: Baksmaling classes3.dex...
I: Baksmaling classes4.dex...
I: Copying assets and libs...
I: Copying unknown files...
I: Copying original files...
dex2jar /root/.Bytecode-Viewer/bcv_temp/WYhdEGYwnGvNUsjsjfnQzjiPBsTgwUTY.apk -> ./WYhdEGYwnGvNUsjsjfnQzjiPBsTgwUTY-dex2jar.jar
java.lang.StringIndexOutOfBoundsException: begin 1, end -1, length 2
at java.base/java.lang.String.checkBoundsBeginEnd(String.java:3319)
at java.base/java.lang.String.substring(String.java:1874)
at org.a.a.b.a.a(Unknown Source)
at org.a.a.b.a.b(Unknown Source)
at org.a.a.a.b.mapSignature(Unknown Source)
at org.a.a.a.d.visitField(Unknown Source)
at org.a.a.f.visitField(Unknown Source)
at com.googlecode.d2j.dex.Dex2Asm.convertField(Unknown Source)
at com.googlecode.d2j.dex.Dex2Asm.convertClass(Unknown Source)
at com.googlecode.d2j.dex.Dex2Asm.convertDex(Unknown Source)
at com.googlecode.d2j.dex.Dex2jar.doTranslate(Unknown Source)
at com.googlecode.d2j.dex.Dex2jar.to(Unknown Source)
at com.googlecode.dex2jar.tools.Dex2jarCmd.doCommandLine(Unknown Source)
at com.googlecode.dex2jar.tools.BaseCmd.doMain(Unknown Source)
at com.googlecode.dex2jar.tools.Dex2jarCmd.main(Unknown Source)
at the.bytecode.club.bytecodeviewer.util.Dex2Jar.dex2Jar(Dex2Jar.java:54)
at the.bytecode.club.bytecodeviewer.BytecodeViewer$8.run(BytecodeViewer.java:957)

Start at Dex2Jar.java:54 and BytecodeViewer.java:957, then trace the dex2jar conversion reported in the stack trace. Reproduce the failure with the affected APK or a comparable multi-dex APK and inspect the failing field-signature path. Done means the conversion no longer aborts with StringIndexOutOfBoundsException and the missing classes are accounted for.

Written by the indexing model from the issue text.