R version 3.2.3 (2015-12-10) -- "Wooden Christmas-Tree"
Copyright (C) 2015 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)

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> x <- c(104.93,105.68,106.93,107.29,107.25,106.74,106.44,106.6,107.26,107.35,107.22,106.99,106.87,107.68,108.9,109.48,109.57,109.03,109.58,109.76,110.15,110.2,109.86,109.58,109.52,110.35,111.61,112.06,111.9,111.36,112.09,112.24,112.7,113.36,112.9,112.74,112.7,113.66,114.87,114.97,115,114.57,115.54,115.39,115.46,115.13,114.56,114.62,114.37,114.86,115.82,116.35,115.95,115.64,116.58,116.5,116.48,116.34,115.65,115.42)
> par3 = 'additive'
> par2 = 'Triple'
> par1 = '12'
> par1 <- as.numeric(par1)
> if (par2 == 'Single') K <- 1
> if (par2 == 'Double') K <- 2
> if (par2 == 'Triple') K <- par1
> nx <- length(x)
> nxmK <- nx - K
> x <- ts(x, frequency = par1)
> if (par2 == 'Single') fit <- HoltWinters(x, gamma=F, beta=F)
> if (par2 == 'Double') fit <- HoltWinters(x, gamma=F)
> if (par2 == 'Triple') fit <- HoltWinters(x, seasonal=par3)
Error in HoltWinters(x, seasonal = par3) : optimization failure
Execution halted