Want know about this error in the picture..?

[Ahami.4]

Hello,

I am using STM32F070*B Nucleo board want to flash the device using Flash Loder demonstration software using UART communication. but this type of warning message came.

Link that i am following:

http://stm32f4-discovery.net/2014/09/program-stm32f4-with-uart/

[Tesla DeLorean]

Indicating the device is not in loader mode. Make sure BOOT0 is high and reset, entry is a one shot deal. Make sure UART being used is supported by loader. Use 9600 with EVEN parity. ​

[Ahami.4]

hii Clive,

Boot 0 pin is high and device on the loader mode. UART is also supported by the loader,9600,even parity,protection level also checked. i am use the correct pin out. any other reason for this error..?

entry is one shot deal..? you mean delay..?