The Compilation Result window opens in a separate window after you click Compile in the Create / Edit Custom Object page. The page includes three sections: Summary, Errors, and Warnings. The Errors and Warnings sections are shown only if the compilation resulted in errors or warnings.
The Summary table provides the number of errors and warnings that occurred, if any. It also indicates whether the custom object is executable. If an error that caused the compilation to fail occurred, the Executable field displays No.
If Errors or Warnings occurred, these two sections show the text of each error or warning.
After reviewing the result of the compilation, click the Close button to return to the Create / Edit custom object page.