Running examples in 'crul-Ex.R' failed
The error most likely occurred in:

> ### Name: HttpClient
> ### Title: HTTP client
> ### Aliases: HttpClient
> 
> ### ** Examples
> 
> ## Not run: 
> ##D # set your own handle
> ##D (h <- handle("https://httpbin.org"))
> ##D (x <- HttpClient$new(handle = h))
> ##D x$handle
> ##D x$url
> ##D (out <- x$get("get"))
> ##D x$handle
> ##D x$url
> ##D class(out)
> ##D out$handle
> ##D out$request_headers
> ##D out$response_headers
> ##D out$response_headers_all
> ##D 
> ##D # if you just pass a url, we create a handle for you
> ##D #  this is how most people will use HttpClient
> ##D (x <- HttpClient$new(url = "https://httpbin.org"))
> ##D x$url
> ##D x$handle # is empty, it gets created when a HTTP verb is called
> ##D (r1 <- x$get('get'))
> ##D x$url
> ##D x$handle
> ##D r1$url
> ##D r1$handle
> ##D r1$content
> ##D r1$response_headers
> ##D r1$parse()
> ##D 
> ##D (res_get2 <- x$get('get', query = list(hello = "world")))
> ##D res_get2$parse()
> ##D library("jsonlite")
> ##D jsonlite::fromJSON(res_get2$parse())
> ##D 
> ##D # post request
> ##D (res_post <- x$post('post', body = list(hello = "world")))
> ##D 
> ##D ## empty body request
> ##D x$post('post')
> ##D 
> ##D # put request
> ##D (res_put <- x$put('put'))
> ##D 
> ##D # delete request
> ##D (res_delete <- x$delete('delete'))
> ##D 
> ##D # patch request
> ##D (res_patch <- x$patch('patch'))
> ##D 
> ##D # head request
> ##D (res_head <- x$head())
> ##D 
> ##D # query params are URL encoded for you, so DO NOT do it yourself
> ##D ## if you url encode yourself, it gets double encoded, and that's bad
> ##D (x <- HttpClient$new(url = "https://httpbin.org"))
> ##D res <- x$get("get", query = list(a = 'hello world'))
> ##D 
> ##D # access intermediate headers in response_headers_all
> ##D x <- HttpClient$new("https://doi.org/10.1007/978-3-642-40455-9_52-1")
> ##D bb <- x$get()
> ##D bb$response_headers_all
> ## End(Not run)
> 
> ## ------------------------------------------------
> ## Method `HttpClient$verb`
> ## ------------------------------------------------
> 
> ## Not run: 
> ##D (x <- HttpClient$new(url = "https://httpbin.org"))
> ##D x$verb('get')
> ##D x$verb('GET')
> ##D x$verb('GET', query = list(foo = "bar"))
> ##D x$verb('retry', 'GET', path = "status/400")
> ## End(Not run)
> 
> ## ------------------------------------------------
> ## Method `HttpClient$retry`
> ## ------------------------------------------------
> 
> ## Not run: 
> ##D x <- HttpClient$new(url = "https://httpbin.org")
> ##D 
> ##D # retry, by default at most 3 times
> ##D (res_get <- x$retry("GET", path = "status/400"))
> ##D 
> ##D # retry, but not for 404 NOT FOUND
> ##D (res_get <- x$retry("GET", path = "status/404", terminate_on = c(404)))
> ##D 
> ##D # retry, but only for exceeding rate limit (note that e.g. Github uses 403)
> ##D (res_get <- x$retry("GET", path = "status/429", retry_only_on = c(403, 429)))
> ## End(Not run)
> 
> ## ------------------------------------------------
> ## Method `HttpClient$url_fetch`
> ## ------------------------------------------------
> 
> x <- HttpClient$new(url = "https://httpbin.org")
> x$url_fetch()
Error in library.dynam(lib, package, package.lib) : 
  DLL 'Rcpp' not found: maybe not installed for this architecture?
Calls: <Anonymous> ... namespaceImportFrom -> asNamespace -> loadNamespace -> library.dynam
Execution halted