Krita AI Diffusion: Resolving Checkpoint Error – Connection with Server is Lost

Experiencing a “Checkpoint Error Connection With Server Is Lost” message in Krita AI Diffusion after updating to version 1.13.0 can be frustrating. This error often indicates that the Krita AI Diffusion plugin is unable to properly communicate with the backend server, specifically related to missing IP-Adapter models post-update.

Based on the server.log file provided, the issue might stem from missing or improperly loaded IP-Adapter models required by the updated version of krita_ai_diffusion. The log itself primarily shows the server starting up and listing imported custom nodes, including ComfyUI_IPAdapter_plus. However, the crucial part of the error message – indicating a missing IP-Adapter model – isn’t explicitly logged here, suggesting the problem arises during the model loading or utilization phase after the server starts.

To troubleshoot this “checkpoint error connection with server is lost” issue, consider the following steps:

1. Verify IP-Adapter Model Installation: Ensure that the necessary IP-Adapter models are correctly installed and located in the appropriate directories for ComfyUI. Double-check the ComfyUI_IPAdapter_plus custom node directory for these models.
2. Check Server Logs for Model Loading Errors: While the provided log shows a successful server start, examine the complete server logs for any errors occurring after startup, specifically related to loading IP-Adapter models or checkpoints. Look for error messages containing keywords like “IP-Adapter”, “checkpoint”, “load”, or “missing”.
3. Restart the Server and Krita: A simple restart of both the Krita AI Diffusion server and the Krita application itself can sometimes resolve temporary connection glitches or loading issues.
4. Reinstall IP-Adapter Plus: Try reinstalling the ComfyUI_IPAdapter_plus custom node. There might have been an issue during the update process that corrupted the installation.
5. Rollback to a Previous Version (Temporary): If the issue persists, consider temporarily reverting to a previous version of krita_ai_diffusion to check if the error is specific to version 1.13.0. This can help isolate whether the update itself introduced the problem.
6. Consult Community Forums: If none of the above steps resolve the “checkpoint error connection with server is lost” error, reach out to the Krita AI Diffusion community forums or the plugin developer for specific guidance. Provide your server.log file and details about your setup for more targeted assistance.

By systematically checking model installations, server logs, and trying basic troubleshooting steps like restarts and re-installations, you can often resolve “checkpoint error connection with server is lost” issues in Krita AI Diffusion and restore functionality to your AI-powered creative workflow.