wavelet analysis

I have been doing wavelet analysis using biwavelet package. When i ran this code i am getting an error.

library(readxl)
library(ggplot2)
library(biwavelet)
data <- read.csv('/home/abhi/Documents/data.csv')
t1 = cbind(1:798, data$Date)
t2 = cbind(1:798, data$Velocity)
nrands = 10
wtc.AB= wtc(t1,t2,nrands=nrands)

Error i am getting;

Error in r[i1] - r[-length(r):-(length(r) - lag + 1L)] :
non-numeric argument to binary operator

please help

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