It seems your project does not point to the directories that contain these include files. Right-click on the project name, select Build Options and in the Compiler tab select Preprocessor category and add the include directories in the box Include Search Path
Typically for the libraries you seem to be using, the directories below should be included:
C: idcsc28DSP280xv141DSP280x_headersinclude
C: idcsDMCc28v32xlibdrvlib280xinclude
This way the compiler will be able to find the missing files.
After doing these modifications, just be sure to include the DMC library correctly or the linker will be the one that will fail.
Hope this helps,