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Errors with quick installer

Question asked by alex on Jan 27, 2014
Latest reply on Jan 28, 2014 by nabeel
Q1:    I downloaded the quick installer.

<code> sudo /opt/mapr-installer/bin/install,

 but failed with disk format. then I try again,I get this error:

<code>"Hadoop found on the path. Please remove all instances before running MapR installer.
A previous version of MapR has been found on this system. Make sure it has been fully uninstalled before running the installer.
Installer failed because certain pre-requisites are not met."

how can i continue to run installer?