LabVIEW Load Error Code 55: Could Not Load Packed Library

Issue Details

I have a Packed Project Library (PPL) that contains multiple VIs. When I open the PPL and double‑click a VI inside it, I receive the following error:

LabVIEW: (Hex 0x625) You cannot load a packed library built for a target or operating system different from the current target or operating system.
An error occurred loading VI "<VI name>.vi"
LabVIEW load error code 55: Could not load packed library

or

LabVIEW: (Hex 0x2B) Operation cancelled by user.
An error occurred loading VI "<VI name>.vi"
LabVIEW load error code 55: Could not load packed library

The error can be shown as the following dialog boxes.

Solution

This error occurs when the PPL was built using a different LabVIEW bitness than the version currently being used to open it. For example:

• If the PPL was compiled in LabVIEW 64‑bit, attempting to open one of its VIs in LabVIEW 32‑bit will trigger this error.
• The same issue occurs in the opposite direction (compiled in 32‑bit, opened in 64‑bit).

To avoid this error, ensure you are opening the PPL with the same LabVIEW bitness used to build it. If you encounter this issue, try opening the PPL using the other bitness of LabVIEW installed on your system.