What is the meaning of assertion failed? I was intended to convert WRF outputs to ARL format using the HYSPLIT GUI in Windows. But It result the next error:

Assertion failed: offset >= 0, file posixio.c, line 465

Assertion failed: offset >= 0, file posixio.c, line 465

while executing

"exec $exec_dir/arw2arl.exe $data_file >STDOUT"

(procedure "xtrct_data" line 37)

invoked from within

"xtrct_data $gdir $gbase"

invoked from within

".arwarch.bot.save invoke"

("uplevel" body line 1)

invoked from within

"uplevel #0 [list $w invoke]"

(procedure "tk::ButtonUp" line 24)

invoked from within

"tk::ButtonUp .arwarch.bot.save"

(command bound to event)

I have no idea what it means,I have succesffuly converted other WRF outputs before, the only difference is that the size of these outputs was less than 3Gb, and t of these that i have the problem the size is almost 5Gb.