PlayApp: java.lang.NullPointerException at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:191)

I'm facing issue with ant command on CheckPlayApp

CheckPlayApp:

PlayApp:
[java] Dec 31, 2020 5:43:00 AM com.google.appinventor.buildserver.ProjectBuilder build
[java] INFO: temporary project root: /tmp/1609393380584_0.5098340428689436-0
[java] Dec 31, 2020 5:43:00 AM com.google.appinventor.buildserver.ProjectBuilder extractProjectFiles
[java] INFO: extracting /tmp/1609393380584_0.5098340428689436-0/android.keystore from input zip
[java] Dec 31, 2020 5:43:00 AM com.google.appinventor.buildserver.ProjectBuilder extractProjectFiles
[java] INFO: extracting /tmp/1609393380584_0.5098340428689436-0/assets/AI2Companion-Icon.png from input zip
[java] Dec 31, 2020 5:43:00 AM com.google.appinventor.buildserver.ProjectBuilder extractProjectFiles
[java] INFO: extracting /tmp/1609393380584_0.5098340428689436-0/assets/Instructions.png from input zip
[java] Dec 31, 2020 5:43:00 AM com.google.appinventor.buildserver.ProjectBuilder extractProjectFiles
[java] INFO: extracting /tmp/1609393380584_0.5098340428689436-0/assets/connectwCode.png from input zip
[java] Dec 31, 2020 5:43:00 AM com.google.appinventor.buildserver.ProjectBuilder extractProjectFiles
[java] INFO: extracting /tmp/1609393380584_0.5098340428689436-0/assets/connectwQR.png from input zip
[java] Dec 31, 2020 5:43:00 AM com.google.appinventor.buildserver.ProjectBuilder extractProjectFiles
[java] INFO: extracting /tmp/1609393380584_0.5098340428689436-0/assets/external_comps/edu.mit.appinventor.companionextras/classes.jar from input zip
[java] Dec 31, 2020 5:43:00 AM com.google.appinventor.buildserver.ProjectBuilder extractProjectFiles
[java] INFO: extracting /tmp/1609393380584_0.5098340428689436-0/assets/external_comps/edu.mit.appinventor.companionextras/component.json from input zip
[java] Dec 31, 2020 5:43:00 AM com.google.appinventor.buildserver.ProjectBuilder extractProjectFiles
[java] INFO: extracting /tmp/1609393380584_0.5098340428689436-0/assets/external_comps/edu.mit.appinventor.companionextras/components.json from input zip
[java] Dec 31, 2020 5:43:00 AM com.google.appinventor.buildserver.ProjectBuilder extractProjectFiles
[java] INFO: extracting /tmp/1609393380584_0.5098340428689436-0/assets/external_comps/edu.mit.appinventor.companionextras/extension.properties from input zip
[java] Dec 31, 2020 5:43:00 AM com.google.appinventor.buildserver.ProjectBuilder extractProjectFiles
[java] INFO: extracting /tmp/1609393380584_0.5098340428689436-0/assets/external_comps/edu.mit.appinventor.companionextras/files/AndroidRuntime.jar from input zip
[java] Dec 31, 2020 5:43:00 AM com.google.appinventor.buildserver.ProjectBuilder extractProjectFiles
[java] INFO: extracting /tmp/1609393380584_0.5098340428689436-0/assets/external_comps/edu.mit.appinventor.companionextras/files/component_build_info.json from input zip
[java] Dec 31, 2020 5:43:00 AM com.google.appinventor.buildserver.ProjectBuilder extractProjectFiles
[java] INFO: extracting /tmp/1609393380584_0.5098340428689436-0/assets/external_comps/edu.mit.appinventor.companionextras/files/component_build_infos.json from input zip
[java] Dec 31, 2020 5:43:00 AM com.google.appinventor.buildserver.ProjectBuilder extractProjectFiles
[java] INFO: extracting /tmp/1609393380584_0.5098340428689436-0/assets/mooning.png from input zip
[java] Dec 31, 2020 5:43:00 AM com.google.appinventor.buildserver.ProjectBuilder extractProjectFiles
[java] INFO: extracting /tmp/1609393380584_0.5098340428689436-0/assets/splash.html from input zip
[java] Dec 31, 2020 5:43:00 AM com.google.appinventor.buildserver.ProjectBuilder extractProjectFiles
[java] INFO: extracting /tmp/1609393380584_0.5098340428689436-0/src/edu/mit/appinventor/aicompanion3/Screen1.bky from input zip
[java] Dec 31, 2020 5:43:00 AM com.google.appinventor.buildserver.ProjectBuilder extractProjectFiles
[java] INFO: extracting /tmp/1609393380584_0.5098340428689436-0/src/edu/mit/appinventor/aicompanion3/Screen1.scm from input zip
[java] Dec 31, 2020 5:43:00 AM com.google.appinventor.buildserver.ProjectBuilder extractProjectFiles
[java] INFO: extracting /tmp/1609393380584_0.5098340428689436-0/src/edu/mit/appinventor/aicompanion3/Screen1.yail from input zip
[java] Dec 31, 2020 5:43:00 AM com.google.appinventor.buildserver.ProjectBuilder extractProjectFiles
[java] INFO: extracting /tmp/1609393380584_0.5098340428689436-0/youngandroidproject/project.properties from input zip
[java] Component assets needed, n = 2
[java] Component activities needed, n = 3
[java] Libraries needed, n = 34
[java] Native Libraries needed, n = 3
[java] Permissions needed, n = 100
[java] Dec 31, 2020 5:43:00 AM com.google.appinventor.buildserver.Compiler generatePermissions
[java] INFO: usesLocation = False
[java] Dec 31, 2020 5:43:00 AM com.google.appinventor.buildserver.Compiler writeAndroidManifest
[java] INFO: VCode: 12825500
[java] Dec 31, 2020 5:43:00 AM com.google.appinventor.buildserver.Compiler writeAndroidManifest
[java] INFO: VName: 2.55
[java] java.lang.NullPointerException
[java] at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:191)
[java] at com.google.common.io.Resources$UrlByteSource.(Resources.java:77)
[java] at com.google.common.io.Resources$UrlByteSource.(Resources.java:72)
[java] at com.google.common.io.Resources.asByteSource(Resources.java:66)
[java] at com.google.common.io.Resources.newInputStreamSupplier(Resources.java:57)
[java] at com.google.appinventor.buildserver.Compiler.libSetup(Compiler.java:2091)
[java] at com.google.appinventor.buildserver.Compiler.runAaptPackage(Compiler.java:1826)
[java] at com.google.appinventor.buildserver.Compiler.compile(Compiler.java:1181)
[java] at com.google.appinventor.buildserver.ProjectBuilder.build(ProjectBuilder.java:169)
[java] at com.google.appinventor.buildserver.Main.main(Main.java:100)

JAVA version
openjdk version "1.8.0_275"

OpenJDK Runtime Environment (build 1.8.0_275-8u275-b01-0ubuntu1~20.04-b01)

OpenJDK 64-Bit Server VM (build 25.275-b01, mixed mode)

ant version
Apache Ant(TM) version 1.10.7 compiled on October 24 2019

Besides the fact that your branch is pretty out of date with App Inventor's master, it seems to me like the libc++.so we include in our sources isn't getting picked up into your buildserver jar. When the system attempts to extract it during compilation you end up with the NPE you're encountering.