WiringPi i2c read or write errno 6 - i2c

Question

Have a nice day. I have a pca9685 controller. When I try to read and write I get the error errno 6.
root#orangepipc:~/wiringOP# i2cdetect -y 0
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: 40 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: 70 -- -- -- -- -- -- --
root#orangepipc:~/wiringOP# i2cdump -y 0 40
No size specified (using byte-data access)
0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef
00: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
10: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
20: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
30: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
40: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
50: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
60: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
70: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
80: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
90: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
a0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
b0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
c0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
d0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
e0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
f0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XXXXXXXXXXXXXXXX
my code
#include <iostream>
#include <stdio.h>
#include <string>
#include <string.h>
#include <cstdlib>
#include <unistd.h>
#include <pthread.h>
#include <wiringPi.h>
#include <wiringPiI2C.h>
#include <errno.h>
using namespace std;
int main()
{
string addr = "/dev/i2c-0";
int fd = wiringPiI2CSetupInterface(addr.c_str(), 40);
if (fd < 0)
printf("wiringPiI2CSetupInterface errno %d\n", errno);
int wr8 = wiringPiI2CWriteReg8(fd, 0x00, 0x00);
if (wr8 < 0)
printf("wiringPiI2CWriteReg8 errno %d\n", errno);
int wr16 = wiringPiI2CWriteReg16(fd, 0x00, 0x00);
if (wr16 < 0)
printf("wiringPiI2CWriteReg16 errno %d\n", errno);
int r8 = wiringPiI2CReadReg8(fd, 0x00);
if (r8 < 0)
printf("wiringPiI2CReadReg8 errno %d\n", errno);
int r16 = wiringPiI2CReadReg16(fd, 0x00);
if (r16 < 0)
printf("wiringPiI2CReadReg16 errno %d\n", errno);
close(fd);
}
console output
wiringPiI2CWriteReg8 errno 6
wiringPiI2CWriteReg16 errno 6
wiringPiI2CReadReg8 errno 6
wiringPiI2CReadReg16 errno 6
I also have a gy521 which behaves exactly the same.
Can this behavior signal a microcomputer i2c bus failure?
Can determining the address of the connected controller ensure that the microcomputer's i2c bus is working properly?
Maybe I'm doing something wrong?
I could not find information about errno 6, please help.
I thought that I did not install the wiringpi correctly, reinstalled several times, different versions.