Questionable use of curly braces in ".model sir870adp vdmos(rg=3 vto=2.9 rd=3.2m rs=1.5m rb={m} kp=100 mtriode=1.85 cgdmax=1.4n cgdmin=70p cgs=2.9n cjo=3.6n m=.4 a=.7 vj=.7 lambda=20m is=3p ksubthres=.08 mfg=siliconix vds=100 ron=5.5m qg=53.5n)"
    Error: undefined symbol in: "[m]"
Circuit: * C:\Users\Szeli Zoltán\Documents\LTSpice\Teljesítményelektronika\Flyback\Flyback.asc

Direct Newton iteration for .op point succeeded.

Date: Mon Feb 27 13:14:35 2017
Total elapsed time: 13.095 seconds.

tnom = 27
temp = 27
method = modified trap
totiter = 1444334
traniter = 1444317
tranpoints = 381779
accept = 277183
rejected = 104596
matrix size = 18
fillins = 2
solver = Alternate
Matrix Compiler1: 1.20 KB object code size  0.5/0.4/[0.3]
Matrix Compiler2: off  [0.4]/0.5/0.5