title: org.apache.cassandra.exceptions.ConfigurationException: Column family ID mismatch
body: <p>This was working without any problems since months, but these days, I am getting this error, any help would be greatly appreciated.</p>
  
  <p><code>com.datastax.driver.core.exceptions.NoHostAvailableException: All host(s) tried for query failed (tried: /localhost:9042 (com.datastax.driver.core.exceptions.ServerError: An unexpected error occurred server side on /localhost:9042: java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.lang.RuntimeException: org.apache.cassandra.exceptions.ConfigurationException: Column family ID mismatch (found 50809440-5f13-11e6-9601-f72eff140960; expected 507fd0f0-5f13-11e6-aa2f-955d215422cf)), /localhost:9042 (com.datastax.driver.core.exceptions.ServerError: An unexpected error occurred server side on /localhost:9042: java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.lang.RuntimeException: org.apache.cassandra.exceptions.ConfigurationException: Column family ID mismatch (found 50809440-5f13-11e6-9601-f72eff140960; expected 507fd0f0-5f13-11e6-aa2f-955d215422cf)), /localhost:9042 (com.datastax.driver.core.exceptions.ServerError: An unexpected error occurred server side on /localhost:9042: java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.lang.RuntimeException: org.apache.cassandra.exceptions.ConfigurationException: Column family ID mismatch (found 50809440-5f13-11e6-9601-f72eff140960; expected 507fd0f0-5f13-11e6-aa2f-955d215422cf)))
  com.datastax.driver.core.exceptions.NoHostAvailableException: All host(s) tried for query failed (tried: /localhost:9042 (com.datastax.driver.core.exceptions.ServerError: An unexpected error occurred server side on /localhost:9042: java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.lang.RuntimeException: org.apache.cassandra.exceptions.ConfigurationException: Column family ID mismatch (found 50809440-5f13-11e6-9601-f72eff140960; expected 507fd0f0-5f13-11e6-aa2f-955d215422cf)), /localhost:9042 (com.datastax.driver.core.exceptions.ServerError: An unexpected error occurred server side on /localhost:9042: java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.lang.RuntimeException: org.apache.cassandra.exceptions.ConfigurationException: Column family ID mismatch (found 50809440-5f13-11e6-9601-f72eff140960; expected 507fd0f0-5f13-11e6-aa2f-955d215422cf)), /localhost:9042 (com.datastax.driver.core.exceptions.ServerError: An unexpected error occurred server side on /localhost:9042: java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.lang.RuntimeException: org.apache.cassandra.exceptions.ConfigurationException: Column family ID mismatch (found 50809440-5f13-11e6-9601-f72eff140960; expected 507fd0f0-5f13-11e6-aa2f-955d215422cf)))
  </code></p>
  
  <p>Even while dropping the already created table using DataStax DevCenter, I see the following :</p>
  
  <p><a href="https://i.stack.imgur.com/PZjl8.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/PZjl8.png" alt="enter image description here"></a></p>