The Icon "lvapp.ico" Could Not Be Written to the Application

Issue Details

How do I resolve this error?

Solution

There are several potential causes of this error, all relating to the location of your application build folders.

• Make sure the location of your build or build folder is not open in a Windows Explorer window.
• Make sure the the same build folder for multiple versions of the same application is not reused. If you need to update and re-build a project, use a new folder name.
  • This can be done using Version Tags to automatically append a version number to the folder name.
• If you aren't using version tags, un-check Auto Increment Version Number in the Version Information tab of the Application Builder.
• Changing the build destination folder to above the Windows User level.
• Perform a Mass Compile of the project.
• Try building just a blank application to see if the problem persists regardless of project.
• Some characters in file names are known to cause weird errors, such as \ / : * ? " < > | . Make sure these characters do not appear in the names of VIs or files that are in the project.
• Replace lvapp.ico with a copy from a working version of Application Builder.
• Disable the antivirus on the computer. The antivirus may interfere mid-way the building process. 
• If disabling the antivirus is not an option, then perform the following steps:
  • Navigate to C:\Program Files (x86)\National Instruments\LabVIEW 201X\vi.lib\Platform and double click on the icon.llb. This will launch the LabVIEW LLB Manager.
  • Open the Write Icons to Application.vi and on the block diagram, increase the number of iterations of the for loop from 3 to a higher number (e.g. 20). This will allow the Application Builder to attempt to write the icon more times, increasing the chances of success.
  • Save and close this VI > Attempt to build your application again.  
• Try force reinstalling LabVIEW Application Builder.
• Re-install LabVIEW.
• Upgrade to LabVIEW 2020 SP1 or later.