Traffic ERROR: no Data Source associated. Check Template

[ando0689]

Good Day,

Some days ago I have imported a set of templates to monitor qnap nas device with my cacti 0.8.7i installation. And after this I cannot add any network interface monitoring graph

I am getting this error
Created graph: MY_HOST_NAME - Traffic - |query_ifName| - |query_ifAlias|
ERROR: no Data Source associated. Check Template

Can anyone help me to solve this problem?

[ando0689]

Isen't there any suggestions how can I solve this? Or may be I need to provide more details?
Please, help me