Custom module installation issue

Hi, I am trying to create a custom module and trying to install it via the admin area. I have modified the files and folders as per the documentation in the module folder. When I am trying the install the module, it is giving me this error: "Class 'Corals Modules Campaign database migrations CampaignTables' not found" My module name is Campaign. What should I do to solve this error and install the module? Thanks