Project Contains Errors. Automated Testing Not Possible!!

Tue Nov 27 23:28:22 CET 2018
Buildfile: /Volumes/data/fontys/modules/alda/2018/practical_students/doc/aldabuild.xml

compile:
    [javac] Compiling 2 source files to /Volumes/data/fontys/modules/alda/2018/practical_students/g35/trunk/01_appointment/AppointmentPlanner/build/classes
    [javac] /Volumes/data/fontys/modules/alda/2018/practical_students/g35/trunk/01_appointment/AppointmentPlanner/src/appointmentplanner/Day.java:110: error: cannot find symbol
    [javac]                 if (duration.getTimeSpanInMinutes() <= gap.getLength().getTimeSpanInMinutes()) {
    [javac]                                                        ^
    [javac]   symbol:   variable gap
    [javac]   location: class Day
    [javac] Note: /Volumes/data/fontys/modules/alda/2018/practical_students/g35/trunk/01_appointment/AppointmentPlanner/src/appointmentplanner/Day.java uses unchecked or unsafe operations.
    [javac] Note: Recompile with -Xlint:unchecked for details.
    [javac] 1 error