The most common cause of this is that the task in question is being asked to load the file into, or create a folder in a specific location that does not exist on your new server.
You will need to check the task in question as it is likely that the step that creates the file is returning an error. To do this: Note that you will need to be able to use the Access TaskCentre application to be able to check and update your task.
Log into Access TaskCentre
Locate and right-click the Task that is responsible for creating the file, and select Event Log. This will show you a list of events relating to the task when it runs
Look for any lines that are reporting errors
With this issue,you are usually looking for an error such as Creating folder/file xxxxxxxxxxx failed (where xxxx is a folder path
Ensure that the folder path referred to exists on the system running the TaskCentre application and services.
Alternatively, to update the path to refer to a different folder:
Double-click the Task to open the designer for the task
Locate and double-click the relevant Step (usually a Save as file step)
On the Main tab, check the location and filename. This is where the system will try to save the file.
Update the folder paths and filename as needed.
Click OK.
Note: If your file is used by further steps in the task (such as an FTP file transfer step) you will need to ensure that the locations used by the relevant steps are also changed.Save the task. Your task should now run as expected.