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isOverlap method problems

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I trying to invoke an isOverlap method from within a Calendar class. The Timespan method tests for overlapping appointments.
The error message I get is:
java:114: Incompatible type for method. Can't convert Appointment to Timespan.
if (theDuplicates.isOverlap(nextApp))
What is the problem and how do I correct the problem and accomplish the my goal?

(edited by Cindy to format code using [ code] and [ /code] tags without the spaces)
[ January 21, 2003: Message edited by: Cindy Glass ]
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