Import custom indicator - Undeclared identifier

[fmazzot]

Hi,
I tried to import indicator trading volume index that i attached.

On my project i receive this error Undeclared identifier

https://fxdreema.com/shared/Hzf8PzFN

Where am I doing wrong?

Thanks for your help.

0_1590416979063_Trading Vol Index.ex4

[fmazzot]

I solved it, thanks anyway