6323 - digital output

I am just trying to write out an 8 bit output. But i am getting and Error -- Append output -200488. I am not sure.. i set my line to Dev1/port0/line0:7 or create a task in NI max with line 0 to 7.

I am also getting this error if i try to assign a name to the task -- via fieldd 'assign a name' or tie a task name to task -- How do i get a task name