cannot flash stm32f4x with openocd and using segger as SWD

when i try to program the controller it shows the follows

Open On-Chip Debugger 0.10.0 (2017-08-21) [https://github.com/sysprogs/openocd]
Licensed under GNU GPL v2
For bug reports, read
        http://openocd.org/doc/doxygen/bugs.html
adapter speed: 400 kHz
adapter speed: 2000 kHz
adapter_nsrst_delay: 100
none separate
cortex_m reset_config sysresetreq
Info : No device selected, using first device.
Info : J-Link V9 compiled May 17 2019 09:50:41
Info : Hardware version: 9.10
Info : VTarget = 3.324 V
Info : clock speed 2000 kHz
Info : SWD DPIDR 0x2ba01477
Info : stm32f4x.cpu: hardware has 6 breakpoints, 4 watchpoints
    TargetName         Type       Endian TapName            State
--  ------------------ ---------- ------ ------------------ ------------
 0* stm32f4x.cpu       cortex_m   little stm32f4x.cpu       halted
adapter speed: 2000 kHz
target halted due to debug-request, current mode: Thread
xPSR: 0x01000000 pc: 0xfffffffe msp: 0xfffffffc
Info : device id = 0x10006431
Info : flash size = 256kbytes
cleared protection for sectors 0 through 5 on flash bank 0
adapter speed: 2000 kHz
target halted due to debug-request, current mode: Thread
xPSR: 0x01000000 pc: 0xfffffffe msp: 0xfffffffc
stm32x mass erase complete
adapter speed: 2000 kHz
target halted due to debug-request, current mode: Thread
xPSR: 0x01000000 pc: 0xfffffffe msp: 0xfffffffc
auto erase enabled
Error: couldn't open 0x8000000

please any one can help