Investigate a Failed Deployment

When a deployment fails, you investigate, correct, and deploy again.

Follow these steps:

On the Deployments Page, in the left hand column, find the deployment with an error and note its name.
Click the Tasks tab and then click Task History.
Note: Click Refresh on the right hand side of the Task History bar to refresh the Task History display.
At the Show bar, select All tasks, or select My tasks to only see the tasks assigned to you.
Note: You can refine the task list further by selecting task and status types from the drop-down lists, and then sort by Task ID.
Find the failed deployment step and click the link in the Name column.
The Task Output Browser appears.
Click the link in the Name column to view the results, and click on the messages logs to review the details for each error.
Note: You can analyze the error results and determine the steps required to troubleshoot them.
Correct the issue and deploy again.

More information: