SNMP variable Hikvision Cam give #bad in reading

Hi,

when I try to read a SNMP variable Hikvision Cam, the SCADA Citect give me the value #bad.

If I try to read that variable by a MIB Browser is working.

in the same project I already read other snmp variables of another device and it works.

I only have problems with this camera. 

Thanks :D