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warning C318: can't open file 'sample delay.h'

chandra Sekaran 

#include <reg51.h>
//#include "sample delay.h"
void MSDelay(unsigned int);
void main(void)
{
while (1) //repeat forever
{
P1=0x55;
MSDelay(250);
P1=0xAA;
MSDelay(250);
}
}


#include "sample delay.h"
void MSDelay(unsigned int itime)
{
unsigned int i,j;
for (i=0;i<itime;i++)
for (j=0;j<1275;j++);
}

while do build it displays a warning message in the build window as below
sample delay.c(1): warning C318: can't open file 'sample delay.h'
please help me in finding out the causes for this warning.

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