This error appears when attempting to install software using IBMs Installation Manager.

Your user ID or group has insufficent permissions granted for the installation directory path: /opt/IBM/AppServer. 
Ensure that your user ID or group has at least write permission to the installation directory 
and execute permission to each directory preceding the installation directory.

As the error suggests, you will first want to ensure that your user ID or group has the write permission to the installation directory. In this example, the installation directory is /opt/IBM/AppServer, so you would want to make sure that the /opt/IBM/AppServer has the w (write) permission. In this example, the root user and root group has the write permission, so as long as you are issuing the command as root, then the /opt/IBM/AppServer directory has the appropriate write permission.

~]# ll /opt/IBM
drwxrwsr-x  2  root  root  4096  Jul 21 2018  AppServer

The error also suggests that every preceding directory has the execute permission. In this example, each preceding directory has the execute permission.

~]# ll /opt
drwxrwsr-x  2  root  root  4096  Jul 21 2018  IBM

~]# ll /
drwxrwsr-x  2  root  root  4096  Jul 21 2018  opt

If the permissions are correct, yet the error persists, the installation directory may not be in the correct case. For example, if the installation directory specified in the Installation Manager command is /opt/IBM/AppServer, but the actual directory on the server is /opt/ibm/appserver (lower case), this would cause the fault, as the directory in the Installation Manager command does not have the same case as the directory on the server.