title: Error: stat_count() in ggplot2
body: <p>In many of my programs I have been using ggplot2 to render charts.  I have loaded them on shinyapps.io and they are working absolutely fine.  However, when I try to run the program on my machine, i am getting the following error:</p>
  
  <pre><code>Error : stat_count() must not be used with a y aesthetic.
  </code></pre>
  
  <p>The following is the example code:</p>
  
  <pre><code>ggplot(hashtg, aes(x=reorder(hashtag, Freq), y = Freq, fill = hashtag)) + geom_bar(stat="identity") +
                  geom_bar(width = 0.4) + xlab("Hashtags Used") + ylab("Number of responses") + 
                  geom_text(aes(label=Freq), hjust = 1, colour = "white" )
  </code></pre>
  
  <p>The actual code has many arguments of bar graph such as title, theme &amp; annotation, but I guess they would not hamper the output.  I am using aggregated data where <code>Freq</code> in the code is the frequency of a particular term.  When I searched for help, I repeated get instructions to use <code>stat = "identity"</code> for a bar plot.  </p>
  
  <p>Any help would be highly appreciated.</p>
  
  <p>The session info is as follows:</p>
  
  <pre><code>R version 3.2.0 (2015-04-16)
  Platform: x86_64-apple-darwin13.4.0 (64-bit)
  Running under: OS X 10.10.3 (Yosemite)
  
  locale:
  [1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
  
  attached base packages:
  [1] stats     graphics  grDevices utils     datasets  methods   base     
  
  other attached packages:
   [1] wordcloud_2.5        RColorBrewer_1.1-2   SnowballC_0.5.1      ggplot2_2.0.0        plyr_1.8.3          
   [6] chron_2.3-47         RCurl_1.95-4.7       bitops_1.0-6         ROAuth_0.9.6         RJSONIO_1.3-0       
  [11] twitteR_1.1.9        base64enc_0.1-3      tm_0.6-2             NLP_0.1-8            stringr_1.0.0       
  [16] shinydashboard_0.5.1 shinyIncubator_0.2.2 shiny_0.12.2        
  
  loaded via a namespace (and not attached):
   [1] Rcpp_0.12.1       tools_3.2.0       digest_0.6.8      bit_1.1-12        jsonlite_0.9.17   gtable_0.1.2     
   [7] DBI_0.3.1         rstudioapi_0.3.1  curl_0.9.3        parallel_3.2.0    httr_1.0.0        bit64_0.9-5      
  [13] grid_3.2.0        R6_2.1.1          magrittr_1.5      scales_0.3.0      htmltools_0.2.6   colorspace_1.2-6 
  [19] mime_0.4          xtable_1.7-4      httpuv_1.3.3      labeling_0.3      stringi_0.5-5     munsell_0.4.2    
  [25] slam_0.1-32       rjson_0.2.15      rstudio_0.98.1103
  </code></pre>
  
  <p>To reiterate, the same code works without a trouble in shinyapps.io.</p>