Unable to build prerequisite module: Test-WWW-Simple (0.18) Unable to build prerequisite module: Encode (0) Unable to build prerequisite module: WWW-Mechanize-Pluggable (0.09) Unable to build prerequisite module: Test-Differences (0) Unable to build prerequisite module: Sub-Installer (0) Unable to build prerequisite module: WWW-Mechanize (1.16) App-SimpleScan could not be built due to the above failed prerequisites.