title: invalid color name background in qgraph
body: <p>I have been trying to use <code>qgraph</code> to generate the network graph. The code is as following</p>
  
  <pre><code>Gw &lt;- qgraph(edgeList, diag = TRUE, labels = TRUE,legend.cex = 0.3, vsize = 1,edge.color=colorLabels,legend=TRUE,asize=1)
  </code></pre>
  
  <p>The figure can be generated, but the R command line gives the following error message. I do not know what does the <code>invalid color name 'background'</code> mean.</p>
  
  <p>The <code>dput</code> result is shown as follows,</p>
  
  <blockquote>
    <p>dput(edgeList)
    structure(c("1", "2", "2", "3", "4", "5", "6", "7", "8", "1", 
    "9", "10", "11", "12", "13", "14", "15", "16", "17", "18", "16", 
    "4", "5", "7", "1", "9", "10", "19", "20", "2", "16", "21", "3", 
    "22", "5", "23", "8", "1", "20", "2", "13", "14", "17", "14", 
    "1", "19", "14", "2", "21", "14", "24", "1", ":499.3", "nk Transfe", 
    "de of tran", "up(non-US ", "up(non-US ", "up(non-US ", "up(non-US ", 
    "up(non-US ", "up(non-US ", "up(non-US ", "up(non-US ", "up(non-US ", 
    "ine:4121", "ine:3257.4", "ine:75.2", "ine:75.2", "ine:11615.", 
    "ine:10603", "ine:334.2", "ine:7256.8", "ine:7256.8", "ine:996.8", 
    "ine:884.6", "ine:364.9", "ine:6360", "ine:5640.9", "ine:2729.7", 
    "ine:5482.6", "ine:85", "ine:1474.9", "ine:700.8", "ine:2754.6", 
    "ine:3257.4", "ine:3257.4", "ine:7307.8", "ine:18560.", "ine:85.1", 
    "ine:364.8", ":700.1", ":5317", "l:4258.9", "l:4258.9", "l:1637.6", 
    "l:1637.6", "l:46.4", "l:3938.5", "l:3938.5", "l:2800.4", "l:2715.1", 
    "l:2715.1", "l:12708.2", "l:1042", ":499.3", "nk Transfe", "de of tran", 
    "up(non-US ", "up(non-US ", "up(non-US ", "up(non-US ", "up(non-US ", 
    "up(non-US ", "up(non-US ", "up(non-US ", "up(non-US ", "ine:4121", 
    "ine:3257.4", "ine:75.2", "ine:75.2", "ine:11615.", "ine:10603", 
    "ine:334.2", "ine:7256.8", "ine:7256.8", "ine:996.8", "ine:884.6", 
    "ine:364.9", "ine:6360", "ine:5640.9", "ine:2729.7", "ine:5482.6", 
    "ine:85", "ine:1474.9", "ine:700.8", "ine:2754.6", "ine:3257.4", 
    "ine:3257.4", "ine:7307.8", "ine:18560.", "ine:85.1", "ine:364.8", 
    ":700.1", ":5317", "l:4258.9", "l:4258.9", "l:1637.6", "l:1637.6", 
    "l:46.4", "l:3938.5", "l:3938.5", "l:2800.4", "l:2715.1", "l:2715.1", 
    "l:12708.2", "l:1042", "25", "1", "1", "26", "27", "28", "29", 
    "30", "31", "25", "32", "33", "4", "4", "3", "3", "5", "5", "7", 
    "6", "6", "27", "28", "30", "25", "32", "33", "9", "8", "1", 
    "1", "10", "12", "12", "16", "16", "16", "16", "8", "1", "3", 
    "3", "7", "7", "25", "9", "9", "1", "10", "10", "14", "14"), .Dim = c(104L, 
    2L), .Dimnames = list(NULL, c("newsendId", "newtoId")))</p>
  </blockquote>
  
  <p>The generated figure is as follows. I used the following command to generate it</p>
  
  <pre><code>Gw &lt;- qgraph(edgeList, layout = "spring", diag = FALSE, labels = TRUE, cut = NULL, edge.color = "red",legend.cex = 0.5, vsize = 8)
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/lHDcE.png" alt="enter image description here"></p>