title: Association Rules Error
body: <p>I am running the formula that is given below in R</p>
  
  <pre><code>rules &lt;- apriori(B4_Temp,
    parameter = list(minlen=2, supp=0.001, conf=0.6,target="rules"),
    appearance = list(rhs=c("Location Info=Level1"),default="lhs"),
    control = list(verbose=F))
  </code></pre>
  
  <p>I am getting this error as:</p>
  
  <pre><code>Error in asMethod(object) : 
    Location Info=Level1 is an unknown item label,
    Location Info=Entrance is an unknown item label
  </code></pre>
  
  <p>But I have those values in the data set. What is the problem?</p>