Sumif function? Two variables return error #VALUE

Hi everyone,

I am trying to automatize a staffing sheet where people fill in occupation by hour and position. Since it will likely cover multiple sites, I want to include a total at the bottom where people can switch between sites easily.

For some reason, I get a VALUE error when trying the sumif function with multiple variables (see cell F69 in attached doc).

The regular sumif function works fine but does not allow for a second variable.

Thanks for the help!