Error in as.character: cannot coerce type 'closure' to vector of type 'character'

[systematicinvestor]

Error in as.character: cannot coerce type 'closure' to vector of type 'character'

[englianhu]

test with windows with latest version shiny and ®Studio but similar error.

- Warning: Error in as.character: cannot coerce type 'closure' to vector of type 'character'
Stack trace (innermost first):
    82: tagList
    81: as.tags.default
    80: as.tags
    79: inherits
    78: isTag
    77: rewriteTags
    76: tagify
    75: func
    74: rewriteTags
    73: tagify
    72: htmlDependencies
    71: findDependencies
    70: resolveDependencies
    69: lapply
    68: output$status
     1: shiny::runApp

> packageVersion('shiny')
[1] ?.13.2.9003?
> devtools::session_info()$platform
Session info ----------------------------------------------------------------------------------------
 setting  value                       
 version  R version 3.3.0 (2016-05-03)
 system   x86_64, mingw32             
 ui       RStudio (0.99.1130)         
 language (EN)                        
 collate  English_United States.1252  
 tz       GMT                         
 date     2016-05-11