ERROR: CAN'T OPEN FILE

when i am building program without making hex file . it will work perfectly .but when i build program with hex file it will give error can't open file. this message is displayed of build output box:

Build target 'Target 1'
linking...
Program Size: data=11.0 xdata=0 code=67
creating hex file from "blink"...
OBJECT TO HEX FILE CONVERTER OH51 V2.6
COPYRIGHT KEIL ELEKTRONIK GmbH 1991 - 2001
*** ERROR: CAN'T OPEN FILE 'blink'
"blink" - 0 Error(s), 0 Warning(s).