how did you published this workbook? You forgot to uncheck the option include external files?
The Tableau User that running the service has permission on this network drive?
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James- In addition to Paulo's suggestions, I'd like to add these,
1) Make sure Tableau Server has permissions to the network folder where the file is located.
2) Use UNC path to the location of the file instead of generic path.
check this thread- How to set UNC path for Excel Based Extract?
Hope this helps.
Published the data source by using Serer tab > Publish data source > selected the data source then selected the project for it to go into, set the refresh schedule for Weekday early mornings ...Permissions is locked by site admin.