"File can not be opened" compiler error in MPLABX /MPLAB IDE - microcontroller

Question

I'm a newbie trying to lean PIC, I downloaded MPLAB and MPLAB X IDE. I have done this around 100 times and looked over web enough before asking this question, but my code does not compile and it always fails.
Here is what I did:
Created a new project using the project wizard,
Edited the code,
Copied the 16F871.H library header in both folder (I created the project in) and added it to the header files in MPLAB IDE.
Here's my code:
// IFIN.C Tests an input
#include " 16F877A.h "
void main()
{
int x; // Declare variable
output_D(0); // Clear all outputs
while(1) //
{
x = input(PIN_C0); // Get input state
if(x = = 1)
output_high(PIN_D0); // Change output
}
}
But on compiling the code, I'm getting the following error:
Executing:
"C:\Program Files\PICC\Ccsc.exe" +FM "NEW.c" #__DEBUG=1 +ICD +DF +LN
+T +A +M +Z +Y=9 +EA #__16F877A=TRUE
*** Error 18 "NEW.c" Line 2(10,23): File can not be opened
Not in project "C:\Users\jatin\Desktop\DHAKKAN PIC\ 16F877A.h "
Not in "C:\Program Files\PICC\devices\ 16F877A.h "
Not in "C:\Program Files\PICC\drivers\ 16F877A.h "
*** Error 128 "NEW.c" Line 2(10,17): A #DEVICE required before this line
*** Error 12 "NEW.c" Line 6(9,10): Undefined identifier -- output_D
*** Error 12 "NEW.c" Line 9(10,11): Undefined identifier -- input
*** Error 51 "NEW.c" Line 10(8,9): A numeric expression must appear here
5 Errors, 0 Warnings. Build Failed. Halting build on first failure as requested.
BUILD FAILED: Mon Jul 08 15:09:17 2013
I would be grateful if you could help me.

Answer 1

The error with respect to the header file not being found is that you have extra space in the header name. In other words, this:
#include " 16F877A.h "
should be:
#include "16F877A.h"
The other errors are probably a result of this and would go away once the header is properly included.
Note that the compiler literally takes the string inside "" or <> as file name for the header file and doesn't trim whitespaces for you.