diff --git a/injector/launcher_payload/src/dll.c b/injector/launcher_payload/src/dll.c
index 65a8a88..c40828f 100644
--- a/injector/launcher_payload/src/dll.c
+++ b/injector/launcher_payload/src/dll.c
@@ -1,3 +1,5 @@
+#include <stdio.h>
+
 #include <injshared.h>
 
 #include <lpayload.h>
@@ -46,6 +48,10 @@ BOOL WINAPI DllMain(HINSTANCE inst, DWORD reason, LPVOID reserved) {
         &si,
         &pi
     )) {
+        char message[64];
+        sprintf(message, "Failed to start game process: %ld", GetLastError());
+        MessageBoxA(NULL, message, "Jadeite Launcher Payload", MB_OK | MB_ICONERROR);
+
         exit(1);
     }