Parametrized http body json with more than one variable don't work

Hi
I have several variable in my json file, but the request work with this file
{ “data1” : ${value1},
“data2” : ${value1},
“data3”: ${value1}
}
and fail with
{ “data1” : ${value1},
“data2” : ${value2},
“data3”: ${value3}
}
error message
!DOCTYPE html>

Error
Bad Request