From 32b1decd0d98454afc72cbeae53e9624539d5548 Mon Sep 17 00:00:00 2001
From: Him188 <Him188@mamoe.net>
Date: Fri, 28 Feb 2020 08:56:47 +0800
Subject: [PATCH] Add detailed exception prompt

---
 .../jvmMain/kotlin/net/mamoe/mirai/utils/ExternalImageJvm.kt    | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mirai-core/src/jvmMain/kotlin/net/mamoe/mirai/utils/ExternalImageJvm.kt b/mirai-core/src/jvmMain/kotlin/net/mamoe/mirai/utils/ExternalImageJvm.kt
index 099982d8c..8fc3c926d 100644
--- a/mirai-core/src/jvmMain/kotlin/net/mamoe/mirai/utils/ExternalImageJvm.kt
+++ b/mirai-core/src/jvmMain/kotlin/net/mamoe/mirai/utils/ExternalImageJvm.kt
@@ -65,7 +65,7 @@ fun File.toExternalImage(): ExternalImage {
     val input = ImageIO.createImageInputStream(this)
     checkNotNull(input) { "Unable to read file(path=${this.path}), no ImageInputStream found" }
     val image = ImageIO.getImageReaders(input).asSequence().firstOrNull()
-        ?: error("Unable to read file(path=${this.path}), no ImageReader found")
+        ?: error("Unable to read file(path=${this.path}), no ImageReader found (file type not supported)")
     image.input = input
 
     return ExternalImage(