Geeting a ConditionalFilter error

[LaserBones]

I'm trying to run two scripts on a tv show so the intro is fully deinterlaced and the rest is decombed. I'm getting a conditional filter error on the script below but don't quite understand why.

a = Trim(0, 1805).QTGMC(TR0=2, TR1=2, TR2=1, Rep0=1, Rep1=0, Rep2=4, DCT=5, ThSCD1=300, ThSCD2=110, SourceMatch=3, Lossless=2, Sharpness=0.1, Sbb=0, MatchPreset="slow", NoiseProcess=2, GrainRestore=0.0, NoiseRestore=0.4, NoisePreset="slow", StabilizeNoise=false, NoiseTR=0, NoiseDeint="bob")

b = Trim(1806, 3000).ConditionalFilter(ChangeFPS(50), QTGMC(TR0=2, TR1=2, TR2=1, Rep0=1, Rep1=0, Rep2=4, DCT=5, ThSCD1=300, ThSCD2=110, SourceMatch=3, Lossless=2, Sharpness=0.1, Sbb=0, MatchPreset="slow", NoiseProcess=2, GrainRestore=0.0, NoiseRestore=0.4, NoisePreset="slow", StabilizeNoise=false, NoiseTR=0, NoiseDeint="bob").QTGMC(InputType=1), ChangeFPS(50), "IsCombedTIVTC(cthresh=2)")

a + b

[LaserBones]

I've gotten this to mostly work with the code below. However, I'm having trouble getting the second trim to work. part2 returns the entire video not trim(911, 0). How can I get that to work?

part1 = Trim(0, 910).QTGMC(TR0=2, TR1=2, TR2=1, Rep0=1, Rep1=0, Rep2=4, DCT=5, ThSCD1=300, ThSCD2=110, SourceMatch=3, Lossless=2, Sharpness=0.1, Sbb=0, MatchPreset="slow", NoiseProcess=2, GrainRestore=0.0, NoiseRestore=0.4, NoisePreset="slow", StabilizeNoise=false, NoiseTR=0, NoiseDeint="bob").QTGMC(InputType=1)
part2 = Trim(911, 0)
part2 = ConditionalFilter(ChangeFPS(50), QTGMC(TR0=2, TR1=2, TR2=1, Rep0=1, Rep1=0, Rep2=4, DCT=5, ThSCD1=300, ThSCD2=110, SourceMatch=3, Lossless=2, Sharpness=0.1, Sbb=0, MatchPreset="slow", NoiseProcess=2, GrainRestore=0.0, NoiseRestore=0.4, NoisePreset="slow", StabilizeNoise=false, NoiseTR=0, NoiseDeint="bob").QTGMC(InputType=1), ChangeFPS(50), "IsCombedTIVTC(cthresh=2)").invert()

part1 ++ part2

[Selur]

last = Trim(911, 0)

or longer:

part1 = Trim(0, 910)
part1 = part1.QTGMC(TR0=2, TR1=2, TR2=1, Rep0=1, Rep1=0, Rep2=4, DCT=5, ThSCD1=300, ThSCD2=110, SourceMatch=3, Lossless=2, Sharpness=0.1, Sbb=0, MatchPreset="slow", NoiseProcess=2, GrainRestore=0.0, NoiseRestore=0.4, NoisePreset="slow", StabilizeNoise=false, NoiseTR=0, NoiseDeint="bob").QTGMC(InputType=1)
part2 = Trim(911, 0)
part2 = ConditionalFilter(part2.ChangeFPS(50), part2.QTGMC(TR0=2, TR1=2, TR2=1, Rep0=1, Rep1=0, Rep2=4, DCT=5, ThSCD1=300, ThSCD2=110, SourceMatch=3, Lossless=2, Sharpness=0.1, Sbb=0, MatchPreset="slow", NoiseProcess=2, GrainRestore=0.0, NoiseRestore=0.4, NoisePreset="slow", StabilizeNoise=false, NoiseTR=0, NoiseDeint="bob").QTGMC(InputType=1), part2.ChangeFPS(50), "IsCombedTIVTC(cthresh=2)").invert()

part1 ++ part2

[LaserBones]

last = Trim(911, 0)

or longer:

part1 = Trim(0, 910)
part1 = part1.QTGMC(TR0=2, TR1=2, TR2=1, Rep0=1, Rep1=0, Rep2=4, DCT=5, ThSCD1=300, ThSCD2=110, SourceMatch=3, Lossless=2, Sharpness=0.1, Sbb=0, MatchPreset="slow", NoiseProcess=2, GrainRestore=0.0, NoiseRestore=0.4, NoisePreset="slow", StabilizeNoise=false, NoiseTR=0, NoiseDeint="bob").QTGMC(InputType=1)
part2 = Trim(911, 0)
part2 = ConditionalFilter(part2.ChangeFPS(50), part2.QTGMC(TR0=2, TR1=2, TR2=1, Rep0=1, Rep1=0, Rep2=4, DCT=5, ThSCD1=300, ThSCD2=110, SourceMatch=3, Lossless=2, Sharpness=0.1, Sbb=0, MatchPreset="slow", NoiseProcess=2, GrainRestore=0.0, NoiseRestore=0.4, NoisePreset="slow", StabilizeNoise=false, NoiseTR=0, NoiseDeint="bob").QTGMC(InputType=1), part2.ChangeFPS(50), "IsCombedTIVTC(cthresh=2)").invert()

part1 ++ part2

Thank you! I need to wrap my head around "Last". This is the second question on this board where I haven't fully grasped that concept yet.