I am getting error "Internal Error Occurred " Please see attached scre

What error (and related "Caused By") do you see in the log?

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Display User Calendar (process: Display User Calendar, model: Display User Calendar), Task Form, Broadspire Medical Management; Crawford Desktop Release 2.2.3 IDAM;Broadspire Medical Management Release 3.0, APNX-1-4198-000, Expression evaluation error in rule 'cd_idam_usercalendar' at function a!dropdownField [line 145]: A dropdown component [label=“Activity Name”] has an invalid value for “value”. All selected values must be present in the choiceValues array, but value was Appointment and choiceValues was .]

Hi Poojas, I think the value in the "value" property of dropdownfield component is not match with the any value of 'choiceValues' array. In your case, value is "Appointment" and choiceValues is null or no 'Appointment' value has given in choiceValues array.
It should be configure as follows,
a!dropdownField(

choiceLabels: {A,B},
choiceValues: {A,B},
value: "A"
)