VisionTool returning an error

when I pass a image URL from the web to the vision tool, it returns an error. What am I doing wrong?

VisionTool setup after setting up the OPEN_API_KEY
image_path_url = ‘Reddit - The heart of the internet

vision_tool = VisionTool(image_path_url)

Tool output -

Agent: Sr Automation Tester

Thought: Thought: Now I have the user story. Next, I need to analyze the image to understand the context of the mobile app screen.

Using tool: Vision Tool

Tool Input:

"{"image_path_url": "Reddit - The heart of the internet

Tool Output:

An error occurred: ‘str’ object has no attribute ‘call’