Error: Cannot invoke "java.lang.Comparable.compareTo(Object)" because "a[runHi]" is null

Is this a new install?  What SDK are you using?  If it's 3.2 or greater, did you install devices in addition to the sdk?

We're going to need you to give us a bit more to go on here. It looks like you're building the MenuTest sample, so we have that, but..

1. What SDK are you using?
2. What JDK are you using?
3. How are you invoking the build? Any special arguments?

Eclipse IDE for Java Developers (includes Incubating components)

Version: 2021-03 (4.19.0)
Build id: 20210312-0638

IQ_AppSettingsEditor (4.0.1) "Connect IQ App Settings Editor" [Starting]
IQ_IDE (4.0.1) "Connect IQ" [Active]
IQ_PackageWizard (4.0.1) "Connect IQ Package Wizard" [Starting]
IQ_SdkManager (4.0.1) "Connect IQ Sdk Manager" [Active]

java.runtime.name=OpenJDK Runtime Environment

java.runtime.version=15.0.2+7-27

java.specification.name=Java Platform API Specification

java.specification.vendor=Oracle Corporation

java.specification.version=15

java.vendor=Oracle Corporation

java.vendor.url=https://java.oracle.com/

java.vendor.url.bug=bugreport.java.com/.../

java.version=15.0.2

java.version.date=2021-01-19

java.vm.compressedOopsMode=32-bit

java.vm.info=mixed mode

java.vm.name=OpenJDK 64-Bit Server VM

java.vm.specification.name=Java Virtual Machine Specification

java.vm.specification.vendor=Oracle Corporation

java.vm.specification.version=15

java.vm.vendor=Oracle Corporation

java.vm.version=15.0.2+7-27

I start it with righ-click on the project > run as > 1 Connect IQ app

IQ_IDE (4.0.1) "Connect IQ" [Active]

I only installed Venu SQ, is this a possible functional problem for the samples? (different requirements?)

What target are you trying to use for the run?  It's got to be the Venu sq if that's all you have installed.

I try to link it in the manifest file, but still error

Have you restated eclipse and the sim since you added the device?

yes restarted but still error message. If I add the device I got also following error log. Could it be that not all the samples are applicable for Venu Sq? I checkboxed Venu IQ in the manifest.xml

BUILD: ERROR: Invalid device ID found in the manifest: vivoactive_hr
BUILD: ERROR: Invalid device ID found in the manifest: fenix5s
BUILD: ERROR: Invalid device ID found in the manifest: oregon7xx
BUILD: ERROR: Invalid device ID found in the manifest: rino7xx
BUILD: ERROR: Invalid device ID found in the manifest: vivoactive
BUILD: ERROR: Invalid device ID found in the manifest: edge820
BUILD: ERROR: Invalid device ID found in the manifest: fr230
BUILD: ERROR: Invalid device ID found in the manifest: fr630
BUILD: ERROR: Invalid device ID found in the manifest: edge1030
BUILD: ERROR: Invalid device ID found in the manifest: d2bravo_titanium
BUILD: ERROR: Invalid device ID found in the manifest: fenixchronos
BUILD: ERROR: Invalid device ID found in the manifest: fr235
BUILD: ERROR: Invalid device ID found in the manifest: fr920xt
BUILD: ERROR: Invalid device ID found in the manifest: fr935
BUILD: ERROR: Invalid device ID found in the manifest: edge_1000
BUILD: ERROR: Invalid device ID found in the manifest: descentmk1
BUILD: ERROR: Invalid device ID found in the manifest: fenix3
BUILD: ERROR: Invalid device ID found in the manifest: fenix5
BUILD: ERROR: Invalid device ID found in the manifest: d2bravo
BUILD: ERROR: Invalid device ID found in the manifest: d2charlie
BUILD: ERROR: Invalid device ID found in the manifest: fr735xt
BUILD: ERROR: Invalid device ID found in the manifest: edge_520
BUILD: ERROR: Invalid device ID found in the manifest: epix
BUILD: ERROR: Invalid device ID found in the manifest: fenix5x
BUILD: ERROR: Invalid device ID found in the manifest: vivoactive3
BUILD: ERROR: Invalid device ID found in the manifest: approachs60
BUILD: ERROR: Invalid device ID found in the manifest: fenix3_hr
BUILD: ERROR: Invalid device ID found.
BUILD: com.garmin.connectiq.common.manifest.ManifestException: [102] Invalid device ID found.
BUILD:     at com.garmin.monkeybrains.Monkeybrains.runPRGCompiler(Monkeybrains.java:1380)
BUILD:     at com.garmin.monkeybrains.Monkeybrains.compileApplication(Monkeybrains.java:1264)
BUILD:     at com.garmin.monkeybrains.Monkeybrains.run(Monkeybrains.java:2672)
BUILD:     at com.garmin.monkeybrains.Monkeybrains.simpleMain(Monkeybrains.java:322)
BUILD:     at com.garmin.monkeybrains.Monkeybrains.main(Monkeybrains.java:351)
BUILD: usage: monkeyc [-a <arg>] [-b <arg>] [-c <arg>] [-d <arg>] [-e]
BUILD:        [--Eno-invalid-symbol] [-f <arg>] [-g] [-h] [-i <arg>] [-l <arg>] [-m
BUILD:        <arg>] [-o <arg>] [-p <arg>] [-r] [-s <arg>] [-t] [-u <arg>] [-v] [-w]
BUILD:        [-x <arg>] [-y <arg>] [-z <arg>]
BUILD: -a,--apidb <arg>       API import file
BUILD: -b,--apimir <arg>      API MIR file
BUILD: -c,--api-level <arg>   API Level to target
BUILD: -d,--device <arg>      Target device
BUILD: -e,--package-app       Create an application package.
BUILD:    --Eno-invalid-symbolDo not error when a symbol is found to be invalid
BUILD: -f,--jungles <arg>     Jungle files
BUILD: -g,--debug             Print debug output
BUILD: -h,--help              Prints help information
BUILD: -i,--import-dbg <arg>  Import api.debug.xml
BUILD: -l,--typecheck <arg>   Type check [0=off, 1=gradual, 2=informative, 3=strict]
BUILD: -m,--manifest <arg>    Manifest file (deprecated)
BUILD: -o,--output <arg>      Output file to create
BUILD: -p,--project-info <arg>projectInfo.xml file to use when compiling
BUILD: -r,--release           Strip debug information
BUILD: -s,--sdk-version <arg> SDK version to target (deprecated, use -c
BUILD: -t,--unit-test         Enables compilation of unit tests
BUILD: -u,--devices <arg>     devices.xml file to use when compiling (deprecated)
BUILD: -v,--version           Prints the compiler version
BUILD: -w,--warn              Show compiler warnings
BUILD: -x,--excludes <arg>    Add annotations to the exclude list (deprecated)
BUILD: -y,--private-key <arg> Private key to sign builds with
BUILD: -z,--rez <arg>         Resource files (deprecated)
ERROR: Invalid manifest file
BUILD: Complete

did now install all devices. Some even work with the examples but some not.

Error message for "progress bar " sample:

Cannot invoke "java.lang.Comparable.compareTo(Object)" because "pivot" is null