Issue with TDMS file reference stored in FGV. Getting Error 2501

Hi,

I am not sure what am I missing. I wish to create an FGV that has multiple states (Initialize file, Write, Read Close OR Open, Read, Close). I can initialize a file as expected and it also creates a reference number and an actual file on the disk. But it errors out when attempting to write, read or close file.

Only time it works is if I do it all in one go, in linear manner.

Edit: Try this sequence Init>Run, Write>Run or Init>Run then Close>Run.

Please see the attached VI.I would appreciate if someone could point out my mistake. LabVIEW 2019 is used.