HydraCARDs | <p>When opening HydraCALC, you get the error "Invalid Property Value" Runtime 380</p>

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Standalone HydraCALC (Location)

Button: Open Error Type: Runtime Error

Description:

When opening HydraCALC, you get the error "Invalid Property Value" Runtime 380

Cause:

User did not install V50, just ran update from website. Files missing from Hes\HydraCALC\Ver50\Data\Setup folder

Solution:

Run full install of V50

Cause:

User was opening multiple calc files (.WXF) by highlighting them in Windows File Explorer then pressing ENTER to open many in many HydraCALC sessions

Solution:

This method is not recommended. It's better to first open multiple HydraCALC sessions first, then in each one open the .WXF file

Solution was to re-install HydraCALC. During the re-install, choose the REPAIR option if the window opens.

Updated: Jan. 12, 2026, 2:29 p.m. Created: March 1, 2019, midnight