error during add

[meetyingying]

Exception in thread "AWT-EventQueue-0" org.eclipse.jgit.api.errors.JGitInternalException: Exception caught during execution of add command
at org.eclipse.jgit.api.AddCommand.call(AddCommand.java:244)
at com.codymikol.extensions.GitExtensionsKt$stageAll$2.invoke(GitExtensions.kt:42)
at com.codymikol.extensions.GitExtensionsKt$stageAll$2.invoke(GitExtensions.kt:35)
at com.codymikol.extensions.GitExtensionsKt$command$2.invokeSuspend(GitExtensions.kt:24)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
at kotlinx.coroutines.internal.LimitedDispatcher.run(LimitedDispatcher.kt:42)
at kotlinx.coroutines.scheduling.TaskImpl.run(Tasks.kt:95)
at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:570)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:750)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:677)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:664)
Suppressed: kotlinx.coroutines.DiagnosticCoroutineContextException: [androidx.compose.ui.awt.ComposeBridge$coroutineExceptionHandler$1@19a0f946, androidx.compose.runtime.BroadcastFrameClock@584df260, StandaloneCoroutine{Cancelling}@477ed4d8, FlushCoroutineDispatcher@36e2ec60]
Caused by: org.eclipse.jgit.errors.LockFailedException: Cannot lock /home/yingying/Documents/portfolio-YingYing/.git/index. Ensure that no other process has an open file handle on the lock file /home/yingying/Documents/portfolio-YingYing/.git/index.lock, then you may delete the lock file and retry.
at org.eclipse.jgit.dircache.DirCache.lock(DirCache.java:222)
at org.eclipse.jgit.dircache.DirCache.lock(DirCache.java:293)
at org.eclipse.jgit.dircache.DirCache.lock(DirCache.java:259)
at org.eclipse.jgit.lib.Repository.lockDirCache(Repository.java:1294)
at org.eclipse.jgit.api.AddCommand.call(AddCommand.java:129)
... 11 more