Solution
This error will occur when the VI has been set to read-only in Windows. You can change this setting by:
1) Right-clicking on the file in Windows and selecting Properties.
2) If the Read-only box is checked, LabVIEW will not have the ability to change the contents of the file. Deselecting the Read-only box will remove the error.
If this message shows up when saving a LabVIEW project you should change the Read-Only Attribute for each component of the project.
If this happens for all the files that are inside a folder you can change the Read-Only Attribute in the folder containing all the files.