This error indicates that the API key entered in the add-on settings is not recognised or valid. Without a valid key, the add-on cannot connect to our service and will be unable to generate alt text.
Possible causes
- You entered the API key incorrectly (e.g. missing or extra characters).
 - You pasted a partial or broken key.
 - The key has been deleted from your account.
 
How to fix it
Follow the steps below to correct the issue:
- Log into your account
Go to AltTextLab.com and log in. - Go to the API key settings page
Once you're logged in, navigate to API key settings. - Create a new API key
- Click the Create API key button.
- In the popup window, enter a name for your key — this name is just for you, so you can tell where you're using it (e.g. For Firefox Add-on).
- Click Create API Key. - Copy the API key
Your new key will appear. Click to copy it. - Open the extension options in Firefox
In your browser, click the puzzle icon in the toolbar to open the list of installed extensions.
Find AI Alt Text Generator | AltTextLab.com, click the three dots next to it, then choose Options. This will open the extension options page in a new tab. - Remove the old key from the extension
In the API Key field, delete the old key completely. - Paste your API key
Find the API Key field and paste the key you copied earlier. - Save the settings
Click Save to confirm your changes. - Refresh the page
Go back to the webpage where you want to use the extension and refresh it. 
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