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

> ### Name: get_data_action
> ### Title: Get policy actions data from JSON
> ### Aliases: get_data_action get_data_actions
> 
> ### ** Examples
> 
> ## Get relevant JSON for Afghanistan on 16 July 2020
> x <- get_json_actions(ccode = "AFG", from = NULL, to = "2020-07-16")
> 
> ## Get data on policy actions
> get_data_action(x)
# A tibble: 23 x 12
   date_value country_code country_name policy_type_code policy_type_display    
   <date>     <chr>        <chr>        <chr>            <chr>                  
 1 2020-07-16 AFG          Afghanistan  C1               School closing         
 2 2020-07-16 AFG          Afghanistan  C2               Workplace closing      
 3 2020-07-16 AFG          Afghanistan  C3               Cancel public events   
 4 2020-07-16 AFG          Afghanistan  C4               Restrictions on gather~
 5 2020-07-16 AFG          Afghanistan  C5               Close public transport 
 6 2020-07-16 AFG          Afghanistan  C6               Stay at home requireme~
 7 2020-07-16 AFG          Afghanistan  C7               Restrictions on intern~
 8 2020-07-16 AFG          Afghanistan  C8               International travel c~
 9 2020-07-16 AFG          Afghanistan  E1               Income support         
10 2020-07-16 AFG          Afghanistan  E2               Debt/contract relief   
# ... with 13 more rows, and 7 more variables: policyvalue <int>,
#   policyvalue_actual <int>, flagged <lgl>, is_general <lgl>, notes <chr>,
#   flag_value_display_field <chr>, policy_value_display_field <chr>
> 
> ## Get relevant JSON for Afghanistan and Philippines for whole month of
> ## October
> x <- get_json_actions(ccode = c("AFG", "PH"),
+                       from = "2020-10-29",
+                       to = "2020-10-31")
> 
> ## Get data on policy actions
> get_data_actions(x)
Error in UseMethod("mutate") : 
  no applicable method for 'mutate' applied to an object of class "NULL"
Calls: get_data_actions ... <Anonymous> -> <Anonymous> -> <Anonymous> -> <Anonymous>
Execution halted