File Reading Problem

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Mental Image

I have a file full of map data stored as bytes. I am trying to read it into a pre-defined array using this code:

	file=OpenStream("level1.dat") 
	If Not file RuntimeError "failed to open level1.dat file"
	databyte=0
	For x=0 To 170
		For y=0 To 12
			MapData[databyte]=ReadByte file
			databyte:+1
		Next
	Next
	
	CloseStream file

but get the following error:

"Compile Error
Unable to convert from 'Int(Tstream)' to 'Int'

Please help before I chuck the computer into the river..