私聊正常，群聊出现以下报错(°∀。)
java.lang.reflect.InvocationTargetException at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:568) at kotlin.reflect.jvm.internal.calls.CallerImpl$Method.callMethod(CallerImpl.kt:97) at kotlin.reflect.jvm.internal.calls.CallerImpl$Method$Instance.call(CallerImpl.kt:113) at kotlin.reflect.jvm.internal.KCallableImpl.call(KCallableImpl.kt:108) at kotlin.reflect.jvm.internal.KCallableImpl.callDefaultMethod$kotlin_reflection(KCallableImpl.kt:159) at kotlin.reflect.full.KCallables.callSuspendBy(KCallables.kt:74) at net.mamoe.mirai.console.internal.command.CommandReflector$findSubCommands$6$1.invokeSuspend(CommandReflector.kt:305) at net.mamoe.mirai.console.internal.command.CommandReflector$findSubCommands$6$1.invoke(CommandReflector.kt) at net.mamoe.mirai.console.internal.command.CommandReflector$findSubCommands$6$1.invoke(CommandReflector.kt) at net.mamoe.mirai.console.command.descriptor.CommandSignatureFromKFunctionImpl.call$suspendImpl(CommandSignature.kt:88) at net.mamoe.mirai.console.command.descriptor.CommandSignatureFromKFunctionImpl.call(CommandSignature.kt) at net.mamoe.mirai.console.internal.command.CommandManagerImplKt.executeCommandImpl(CommandManagerImpl.kt:167) at net.mamoe.mirai.console.command.CommandManager.executeCommand(CommandManager.kt:131) at net.mamoe.mirai.console.command.CommandManager$INSTANCE.executeCommand(CommandManager.kt) at net.mamoe.mirai.console.command.CommandManager.executeCommand$default(CommandManager.kt:126) at net.mamoe.mirai.console.plugins.chat.command.PluginMain.handleCommand(PluginMain.kt:86) at net.mamoe.mirai.console.plugins.chat.command.PluginMain$onEnable$2$1.invokeSuspend(PluginMain.kt:69) at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33) at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106) at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:571) at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:750) at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:678) at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:665) Caused by: java.lang.NullPointerException: Cannot invoke "javax.imageio.ImageReader.getDefaultReadParam()" because "reader" is null at java.desktop/javax.imageio.ImageIO.read(ImageIO.java:1466) at java.desktop/javax.imageio.ImageIO.read(ImageIO.java:1422) at pers.moe.command.ThrowItCommand.handle(ThrowItCommand.kt:48) ... 26 more