Error: Value cannot be null. Parameter name: g - when adding a group sale reservation

When trying to add a group sale reservation, you may receive the error: 
Value cannot be null.  Parameter name: g.  

This error may occur only on a specific date.
This error message is received when the rate scale field is blank on a program occurring at the time you are attempting to create the Reservation.
User-added image

The error message will resolve, when the program has ended or you attach a rate scale to the reservation. To determine the program causing this issue and resolve the error message we will take the following steps:
  1. From Tickets > Navigate to the Program Calendar
  2. Select the Program that is occurring during the time the error message is received
  3. Navigate to the prices tab
  4. From Tickets > Select Program Search
  5. Search and Select the affected Program Record
  6. Navigate to the Prices Tab
  7. Click Edit for the Quick Itinerary Default > Associate a Rate Scale or change the Pricing Structure to No Default
  8. Save > Attempt to add the Group Reservation
If you are unable to determine the program causing this error, please Contact Support and reference this article. 

Steps to Duplicate

  1. Log in to Altru
  2. Click Sales > Group Sales. 
  3. Go to a specific date on the calendar. 
  4. Right click on the date and click Add. 
  5. Receive error: Value cannot be null. Parameter name: g 
  6. Go to the organization calendar.  Go to the same date. 
  7. Click Add Reservation and receive error again. 
  8. Go to Group Sales, click Add at the top right without selecting a date. 
  9. Type in the same date in the reservation date field, receive error. 
  10. Select the reservation date from the calendar (rather than typing it in) and do not receive an error. 
  11. Save the reservation.


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