Pre arm bad velovcity

hi, i’m new to make drone using apm 2.8 .i’m facing a problem of pre arm bad velocity.i can’t arm the apm board.it’s flashing blue led solid and red led blinking.i have done all the calibration…

plz help me out.

thanks in advance

Without a log it is difficult.

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how to get the log ?

Read this:
http://ardupilot.org/copter/docs/common-downloading-and-analyzing-data-logs-in-mission-planner.html

You will most likely have to post a link to the log stored elsewhere (Dropbox, etc.)

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it displays no log to download. how can i generate the log file?

it displays no log to download.
what should i do now?

Right because you haven’t made a flight apparently. This error indicates your GPS is at fault which also may generate the bad velocity error.

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yes.you are absolutely right .i am facing bad velocity and gps problem… what should i do now?

Are you inside or outside?

i am inside a room…

pre arm check is okay.but apm is not arming whenever i am trying to arm it by shifting the throttle of the transmitter to right for 5 second. apm is still blue led solid and red led blinking. whats the problem?
what should i do now?