Error -61499 Internal Software Error in LabVIEW FPGA

Updated May 31, 2024

Reported In


  • PXI FPGA Module for FlexRIO


  • LabVIEW FPGA Module


  • FlexRIO
  • NI-RIO

Issue Details

  • I am getting Error -61499: LabVIEW FPGA: An internal software error in the LabVIEW FPGA Module has occurred in an FPGA VI at compilation time or while editing a VI.
  • I get Error -61499 while editing an FPGA VI. The error refers to specific FPGA nodes, in my case, the Open FPGA VI Reference vi causes the error when I place it from the palette. 
  • An additional message may be attached saying : "Additional Information: Unsupported or incorrectly typed FPGA Device Family. Use lower case letters only", and may appear from configuration in the Getting Started Projects for RIO.


This error can be caused by a number of different factors. Most commonly, software incompatibilities and corruptions.
Try the following recommendations to attempt to resolve this error:
  • Confirm that you are using a supported OS and LabVIEW version for your compile software.
  • Delete the bitfiles and allow them to be regenerated.
  • Use the Compile Cloud Service or a compile server farm.
    • If a remote compile session does not fix the issue and you have the appropriate Xilinx Compilation Tool installed, try to uninstall the Xilinx Compilation Tool before compiling.
  • Ensure your project and VIs are located in the intended location.
    • If the file paths are too long, use the Files tab in the LabVIEW project to relocate your files.
  • Remove and recreate the build specification.
  • Delete and recreate the affected FPGA nodes.
  • In your FPGA Build Specification, try checking the box with the option Allow removal of implicit enable signals inside single-cycle Timed Loops.
  • Create a new LabVIEW project and add the existing VIs. Try recompiling the FPGA code after doing this.
  • Repair or Reinstall
    • LabVIEW
    • LabVIEW FPGA
    • CompactRIO drivers (if RIO devices are being used)
    • FlexRIO Drivers (if FlexRIO devices are being used)
    • Compilation Tools
    • Reinstall software on cRIO(if RIO devices are being used)
  • For versions 18 or older 
  • As a last resource, you can try to reimage your computer to completely clear any software corruption. Please ask your IT administrator for additional support. 
Please note that this list of steps is not exhaustive due to the number of possible causes. If the error persists after trying these steps, contact NI Support

Additional Information

Before LabVIEW 2018 FPGA, some Xilinx Compilation Tools were not supported on Windows 10 .

You can find which Xilinx Compilation Tool is compatible with your NI FPGA Hardware and download the appropriate version to your development machine.