In file included from ShowerWithFriends.ino:1:
/Users/george/Documents/Arduino/libraries/Sha/sha1.h:26: error: conflicting return type specified for 'virtual void Sha1Class::write(uint8_t)'
/Applications/Arduino.app/Contents/Resources/Java/hardware/arduino/cores/arduino/Print.h:48: error: overriding 'virtual size_t Print::write(uint8_t)'
In file included from ShowerWithFriends.ino:1: /Users/george/Documents/Arduino/libraries/Sha/sha1.h:26: error: conflicting return type specified for 'virtual void Sha1Class::write(uint8_t)' /Applications/Arduino.app/Contents/Resources/Java/hardware/arduino/cores/arduino/Print.h:48: error: overriding 'virtual size_t Print::write(uint8_t)'
A similar error happens for sha256.h