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 two switches.asc

Direct Newton iteration for .op point succeeded.
Heightened Def Con from 0.000614346 to 0.000614346

Date: Mon Mar 13 16:54:59 2017
Total elapsed time: 12.582 seconds.

tnom = 27
temp = 27
method = modified trap
totiter = 1236250
traniter = 1236243
tranpoints = 338558
accept = 237311
rejected = 101248
matrix size = 23
fillins = 7
solver = Alternate
Matrix Compiler1: 1.97 KB object code size  1.2/0.6/[0.6]
Matrix Compiler2: 2.13 KB object code size  0.5/0.7/[0.4]