Not sure about the .LRN portlet errors but regarding the file storage error, be sure you have a line like this:
ns_param maxinput [expr 20 * 1024 * 1024] ;# Maximum File Size for uploads in bytes
in the
ns_section ns/server/${server}/module/nssock
section of your config.tcl. That should be in most recent versions of config.tcl but perhaps you are using an older version.