In LabVIEW 6.1, the maximum number of front panel objects (controls and indicators) you can have is 555. The error you are getting is typically associated with VIs which exceed this limit.
If you need to place more than 555 objects, you can use one of these techniques:
Use clusters to place groups of related front panel controls or indicators together. For example, if you have ten Boolean switches, and place them inside a cluster, you will have reduced your front panel controls from ten to one.
Use SubVIs to eliminate the number of front panel controls and indicators. This has the benefit of making the user interface easier to use, aids in debugging, improves future manageability of the code, and allows for the reuse of code using SubVI
J.R. Allen
