CCS: CC3200 email_create my own .h and .c file it show error #10234-D: unresolved symbols remain

Tool/software: Code Composer Studio

Hi，

   while iimport email_demo  project from the SDK ,i want to add HTTP function to get file from server.

   so , i create file_download.h and file_download.c to the project and include the head file into the main.c

        the error show below:

b.the filePath add to the project :

c.the include Opitions add to the project :

is there is miss some part of the process to let the project build success .some sugestion will be helpful;

best gards.