title: Interface Builder was unable to determine the type of "Main.storyboard". This may be due to a missing SDK
body: <p>I am getting a strange error whenever I try to view a particular storyboard of a project in Xcode. When I click the storyboard in the file directory I get an alert that reads "Interface Builder was unable to determine the type of "Main.storyboard". This may be due to a missing SDK."</p>
  
  <p>This only happens with this particular storyboard, I tried creating another storyboard and I was able to view it just fine. I tried reverting back to a previous version of the project when I was able to open the storyboard, but oddly enough this doesn't fix the error and I get the same alert. I also tried opening the project in an earlier version of Xcode, but to no avail.</p>
  
  <p>If it provides more context, I get an error for the storyboard I get when I try to build the project that reads "The operation couldn’t be completed. (com.apple.InterfaceBuilder error 2001.)"</p>
  
  <p>Any ideas on what causes this or how to fix it?</p>