HydraCARDs | When running AutoCALC, the process stops around step 2.4c and you get a Run-time error 457, "This key is already associated with an element of this collection <img src="https://hydracards-storage.s3.amazonaws.com/media/public/uploads/2023/06/13/image-20230613121433-2.png" style="height:167px; width:368px" />

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AutoCAD Based Calculations (Ribbon/Toolbar/Location)

Button: Start Autocalcs Error Type: Runtime Error

Description:

When running AutoCALC, the process stops around step 2.4c and you get a Run-time error 457, "This key is already associated with an element of this collection

Solutions:

Cause:

Bad Master.dat file.

Solution:

Replace the Master.dat from a working machine. Located in the C:\HES\HydraCALC\VER50\Data\Setup\ folder.

Cause:

Likely caused by two factors.

1. Two armovers (green pipe) are coming off a branchline (yellow pipe)

2. The 'Set up Drops as Equivalent K-Factors' option is turned on

Solution:

1. Changing the two green pipes to yellow pipes will allow the calc to run through

2. Uncheck the option for 'Setup Drops as Equivalent K-Factors'

Updated: July 6, 2026, 10:42 a.m. Created: June 13, 2023, 12:18 p.m.