what can be the problem. you got any idea?
Launching lib\main.dart on 23127PN0CG in debug mode...
Upgrading build.gradle
Running Gradle task 'assembleDebug'...
ERROR:C:\Users\ciarp\.gradle\caches\transforms-3\3d979c09ae95ea959e87cfa8d7b64639\transformed\jetified-appcompat-resources-1.7.0-runtime.jar: D8: java.lang.NullPointerException
ERROR:C:\Users\ciarp\.gradle\caches\transforms-3\9ff965d89e7c18328de06a7de7f097d3\transformed\appcompat-1.7.0-runtime.jar: D8: java.lang.NullPointerException
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:mergeExtDexDebug'.
> Could not resolve all files for configuration ':app:debugRuntimeClasspath'.
> Failed to transform appcompat-resources-1.7.0.aar (androidx.appcompat:appcompat-resources:1.7.0) to match attributes {artifactType=android-dex, asm-transformed-variant=NONE, dexing-enable-desugaring=true, dexing-enable-jacoco-instrumentation=false, dexing-is-debuggable=true, dexing-min-sdk=23, org.gradle.category=library, org.gradle.dependency.bundling=external, org.gradle.libraryelements=aar, org.gradle.status=release, org.gradle.usage=java-runtime}.
> Execution failed for DexingWithClasspathTransform: C:\Users\ciarp\.gradle\caches\transforms-3\3d979c09ae95ea959e87cfa8d7b64639\transformed\jetified-appcompat-resources-1.7.0-runtime.jar.
> Error while dexing.
> Failed to transform appcompat-1.7.0.aar (androidx.appcompat:appcompat:1.7.0) to match attributes {artifactType=android-dex, asm-transformed-variant=NONE, dexing-enable-desugaring=true, dexing-enable-jacoco-instrumentation=false, dexing-is-debuggable=true, dexing-min-sdk=23, org.gradle.category=library, org.gradle.dependency.bundling=external, org.gradle.libraryelements=aar, org.gradle.status=release, org.gradle.usage=java-runtime}.
> Execution failed for DexingWithClasspathTransform: C:\Users\ciarp\.gradle\caches\transforms-3\9ff965d89e7c18328de06a7de7f097d3\transformed\appcompat-1.7.0-runtime.jar.
> Error while dexing.
> Failed to transform appcompat-1.7.0.aar (androidx.appcompat:appcompat:1.7.0) to match attributes {artifactType=android-dex, asm-transformed-variant=NONE, dexing-enable-desugaring=true, dexing-enable-jacoco-instrumentation=false, dexing-is-debuggable=true, dexing-min-sdk=23, org.gradle.status=release, org.gradle.usage=java-runtime}.
> Execution failed for DexingWithClasspathTransform: C:\Users\ciarp\.gradle\caches\transforms-3\9ff965d89e7c18328de06a7de7f097d3\transformed\appcompat-1.7.0-runtime.jar.
> Error while dexing.
* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.
* Get more help at https://help.gradle.org
BUILD FAILED in 19s
Running Gradle task 'assembleDebug'... 20,6s
Error: Gradle task assembleDebug failed with exit code 1