csabounds package gives this error

[1144heshani]

When doing the example that is given in the website (https://bcallaway11.github.io/csabounds/), we are getting some errors. The errors are explained below. I have provided a screenshot as well. Thank you.

# install.packages("devtools")
devtools::install_github("bcallaway11/csabounds")

library(csabounds)
data(displacements)
delt.seq <- seq(-4,4,length.out=50)
y.seq <- seq(6.5,13,length.out=50)

cc <- qte::CiC(learn ~ treat,
               t=2011, tmin1=2007, tname="year",
               idname="id", panel=TRUE, data=displacements,
               probs=seq(.05,.95,.01),se=FALSE)
cc$F.treated.tmin2 <- ecdf(subset(displacements, year==2003 & treat==1)$learn)
cc$F.treated.tmin1 <- ecdf(subset(displacements, year==2007 & treat==1)$learn)

Error 1: could not find function "Y0tmethod"

cb <- csabounds::csa.bounds(learn ~ treat, 2011, 2007, 2003, "year", "id",
                 displacements, delt.seq, y.seq, cc, method="level", cl=1)
cb
ggCSABounds(cb, wdbounds=TRUE)

Error in Y0tmethod(formla = formla, xformla = xformla, t = t, tmin1 = tmin1, :
could not find function "Y0tmethod"

Error 2: unused argument (method = "level")

Removed "Y0tmethod=cc" and used "Y0tmethod=qte::CiC" because of Error 1.

cb <- csabounds::csa.bounds(learn ~ treat, 2011, 2007, 2003, "year", "id",
                 displacements, delt.seq, y.seq, Y0tmethod=qte::CiC, 
                 method="level", cl=1)
cb
ggCSABounds(cb, wdbounds=TRUE)

Error in Y0tmethod(formla = formla, xformla = xformla, t = t, tmin1 = tmin1, :
unused argument (method = "level")

Error 3: object 'y0t' not found

Removed the unused argument; method = "level" because of Error 2.

cb <- csabounds::csa.bounds(learn ~ treat, 2011, 2007, 2003, "year", "id",
                 displacements, delt.seq, y.seq, Y0tmethod=qte::CiC, cl=1)
cb
ggCSABounds(cb, wdbounds=TRUE)

object 'y0t' not found