usb_open error -12 at program's startup

Hello,

Some people is reporting that is impossible to start Echoes because of the following error appearing in console window:

*Log level: 4
usbopen error -12
critical echoes(0.219) Critical: Main thread:0x32736a0 ERROR: Failed to open rtlsdr device “0: ???

please check here:
https://www.rtl-sdr.com/forum/viewtopic.php?f=7&t=1797

first, for a possible solution.