Would be nice if you could provide some log information, but double check:


Excel Services is actually running on the farm.
Check if you can run Get-SPExcelServiceApplication 
Check the Trusted File Location for Excel Services
Check if your Web Application has a service connection to the Excel Services


EXcel Web Access - web part Error
Do the sentences 


  She might be only 28, but Jodie
  Whittaker....


and


  My parents would have walked along the
  Barrow


wrongly suggest doubt, or are they normal usage? Are there names for these constructions?
Taken from Irish Times .



I googled "would have spent their time". 
Many cases were counterfactuals ("... otherwise they would have spent their time...”)
But plenty simply describe past events, as the in the usage sited above.
I couldn't detect a regional bias.
As an Irish-English speaker this usage is unremarkable for example I might say


  This is the exact spot where Caesar
  would have crossed the Rubicon


I think the intention is to evoke the event rather than just record it.
