Bookings - request can't be completed

[MATTHEW BATCHELOR]

Trying to save the bookings page...

Also getting an error that makes no sense - Please make sure all dates across all service windows do not overlap with each other.  But I have nothing set up. I'm just trying to save the Bookings page.

[#2]

@MATTHEW BATCHELOR 

Same issue =D

[#3]

Bonjour, je veux activer power pivot sur excel mais ca ne marche pas... J'ai suivi les conseils de microsoft mais ca ne marche toujours pas