You are installing either IBM Cognos Express Advisor or IBM Cognos Express Xcelerator and the following message displays:
MOD-ERR-0001 A version of TM1 server has already been installed on this machine
IBM Cognos TM1 is the name of the IBM Cognos product that is integrated with IBM Cognos Express as Xcelerator. Because of a dependency between Advisor and the Xcelerator Server, you cannot install either Advisor or Xcelerator if an instance of TM1 is already installed on your computer.
To resolve this problem, uninstall the TM1 instance and then try the installation again.