VISA error -1073807346 during each run

[tothbalint0316]

Hello everyone,
I have a problem with VISA. Every time when I want to run it I get this error message about my VI:

VISA Write in SKWP_Send_SPC2.vi->SKWP_Send_SPC2.vi.ProxyCaller

VISA: (Hex 0xBFFF000E) The given session or object reference is invalid.
Error code: -1073807346; User-defined error code.

Does anyone know how to solve my problems? 

Best Regards.

[mateusz_owczarek]

I would start with the error message "The given session or object reference is invalid." 

It seems that the reference for your VISA session is wrong, e.g. COM port number is wrong.

Otherwise, you need to open the VI and check what is wrong using debugging techniques

https://www.ni.com/en/support/documentation/supplemental/12/debugging-techniques-in-labview.html