Typo

tool_config.json

@@ -1,7 +1,7 @@
 {
     "custom_tools": {
 	"text-to-image": {
-            "tool_class": "text_to_image.TextToImage",
+            "tool_class": "text_to_image.TextToImageTool",
             "description": "This is a tool that creates an image according to a prompt, which is a text description. It takes an input named `prompt` which contains the image description and outputs an image."
         }
     }