building tutorial with learnr and gradethis

[onyourmark]

I have built a learnr tutorial. It resides on Github.
Here is the access:

devtools::install_github("DataScienceProjectsJapan/TidyverseTutorials")

I tried running it in a fresh project in RStudio cloud. When I go to the Tutorials panel, it shows up there but when I try to run it, I get this error message

Quitting from lines 12-18 (tidyTut.Rmd)
Error: package or namespace load failed for 'gradethis':
 .onLoad failed in loadNamespace() for 'gradethis', details:
  call: (function (exercise.cap = "Code", exercise.eval = FALSE, exercise.timelimit = 30, 
  error: unused argument (exercise.error.check.code = "gradethis_error_checker()")
Execution halted

The code from lines 11-18 are

```{r setup, include=FALSE}
library(learnr)
library(gradethis)
tutorial_options(exercise.checker = gradethis::grade_learnr)
knitr::opts_chunk$set(echo = FALSE)
library(tidyverse)
library(nycflights13)

I checked my Description file and at the end it does reference gradethis (twice)

Imports: 
    dplyr,
    ggplot2,
    gradethis (>= 0.2.3.9001),
    learnr,
    nycflights13,
    plot3D,
    tibble
Remotes: 
    rstudio-education/gradethis
Depends: 
    tidyverse

Can anyone suggest what is wrong?

[grrrck]

The problem is most likely that gradethis requires the development version of learnr and according to your DESCRIPTION file the CRAN version is being installed. You can add rstudio/learnr to your Remotes section (and note that the repository for gradethis has moved).

Remotes:
    rstudio/gradethis
    rstudio/learnr

[onyourmark]

@grrrck

Remotes:
    rstudio/gradethis
    rstudio/learnr

Hi. Thank you. Do I need to remove these from Imports?
gradethis (>= 0.2.3.9001),
learnr,

And I don't understand what you meant by (and note that the repository for gradethis has moved)

[onyourmark]

Hello. I just added what you suggested and it works so ignore my previous message.
Many thanks!