title: Error in length(obj) : class name too long in 'length'
body: <pre><code>#2개년(use: df_3 , MSE: 0.02313121)
   #선형회귀모델
   lm2 &lt;- lm(data = df_3, formula = OPS_y1 ~ (OPS_y2+OPS_y3 + AVG_y2+AVG_y3 + G_y2+G_y3 + GW.RBI_y2+GW.RBI_y3 + H_y2+H_y3  + SAC_y2+SAC_y3)^2) %&gt;% step(direction = "both")
  </code></pre>
  
  <blockquote>
    <p>Error in length(obj) : class name too long in 'length'</p>
  </blockquote>
  
  <p>Once the code has been executed, it will be executed normally. However, if you change the data set and run it again, the same error occurs when you run the first code again. What's the problem? I went to the registry editing window and changed the value of 'LongPathsEnabled' to 1, but it was not resolved. Please solve the problem.</p>