One of the Code Interface Nodes on the block diagram calls an external subroutine, but LabVIEW is unable to find the file (.lsb file) that contains the compiled code for that subroutine.
To correct this error, locate the .lsb file that contains the code for the subroutine. Close the VI and re-open it. When LabVIEW prompts you to find the .lsb file, use the File dialog box to locate the file or enter its full path name.