FileSelectPopup errors out

Runtime error window:

NON-FATAL RUN-TIME ERROR: "c:\...\CVI\Includes\excel_datafile_stuff.c", line 1004, col 13, thread id 9752: Function FileSelectPopup: (return value == -180 [0xffffff4c]). The dialog cannot be displayed in a thread whose concurrency model is multithread apartment (MTA)

Code function call:

char currentFilename[MAX_PATHNAME_LEN] = {"C:\\Users\\Public\\Documents"};

char newFilename[MAX_PATHNAME_LEN];

...

FileSelectPopup (currentFilename, "*.xlsx", "*.xlsx;*.xls;*.txt;*.csv", "Select Data file",
VAL_SELECT_BUTTON, 0, 1, 1, 1, newFilename);

Windows10, CVI 2019

{userint.h}

#define MAX_PATHNAME_LEN 260 /* includes nul byte */

This code worked ok in CVI 2012 - CVI 2017