Opi 2g IOT booting

lokeshraj

hi,
i am working with the orangepi iot 2g board, i sucessfully installed the UBUNTU 16.04 server image and i loged in the wifi also fixed, when i powered on the board after a day, the board is not booting and it shows error as
"no boot file defined "
and it says bad partion and it is not booting stops in "waiting for modem response "


but i already loged in now it shows an error like this ......

help me to come up with better solution



thank you..;.