Error: config validation failed: no valid provider available for agent task

Terminal SS:

The following is my .opencode.json config:

{
  "data": {
    "directory": ".opencode"
  },
  "mcpServers": {
    "example": {
      "command": "path/to/mcp-server",
      "env": [],
      "args": [],
      "type": "stdio",
      "url": "",
      "headers": null
    }
  },
  "providers": {
    "google": {
      "apiKey": "AIzaSyDXUkfdXXXXXX",
      "disabled": false
    },
    "anthropic": {
      "apiKey": "your-api-key",
      "disabled": true
    },
    "groq": {
      "apiKey": "your-api-key",
      "disabled": true
    },
    "openai": {
      "apiKey": "your-api-key",
      "disabled": true
    },
    "openrouter": {
      "apiKey": "sk-or-v1-1b7589a212daXXXXXXXXXXX",
      "disabled": false
    }
  },
  "lsp": {
    "go": {
      "enabled": false,
      "command": "gopls",
      "args": null,
      "options": null
    }
  },
  "agents": {
    "coder": {
      "model": "gemini-2.5-flash-preview-05-20",
      "maxTokens": 5000,
      "reasoningEffort": ""
    },
    "task": {
      "model": "gemini-2.5-flash-preview-05-20",
      "maxTokens": 5000,
      "reasoningEffort": ""
    },
    "title": {
      "model": "gemini-2.5-flash-preview-05-20",
      "maxTokens": 80,
      "reasoningEffort": ""
    }
  },
  "tui": {
    "theme": "opencode"
  },
  "shell": {
    "path": "/bin/bash",
    "args": [
      "-l"
    ]
  },
  "autoCompact": true
}

• i have masked my original google and open-router api keys in the above config for this chat.

• Now when i run opencode command in terminal i am getting the follow error: Error: config validation failed: no valid provider available for agent title

• From my observation, i found this is not working properly with model other than anthropic's for the initial setup. can anyone help me with this??