title: Warning message in mixed model lme4
body: <p>What is the meaning of the following warning message when fitting a 'glmer' model using package lme4?</p>
  
  <pre><code>Warning messages:
  1: glm.fit: fitted probabilities numerically 0 or 1 occurred 
  2: In mer_finalize(ans) : false convergence (8)
  </code></pre>
  
  <p>The model I'm trying to fit is like this:</p>
  
  <pre><code>glmer(dummy ~ constituency.coa + I(governat.part) + I(district2) + gdp.cap + lula.power + ifdm + bf.cap + year + (1 | munname), data=pool, family=binomial(link = "logit"), REML=T, verbose=T)
  </code></pre>
  
  <p>Thanks</p>