Although creating a camp is as easy as creating a class, you cannot create a camp until you have created a Pricing Schedule. Pricing Schedules are how Camps determine how to charge for a camp, as well as determine discounts for anyone who enrolls.

Go to Settings > Setup > General Settings > Pricing Schedules.

On the Pricing Schedule screen, click the “Create New” button.

https://support.iclasspro.com/hc/en-us/articles/218569378-Pricing-Schedules