pulldata function stopped working on my form

LouiseHarris1

I have created a survey in which the user has to select a river which has an auto complete appearance. Once they select the river the river ID should automatically populate using the pulldata fucntion. Since setting this up I amended the form so that they select a region and then when they go to select a river it will only list those rivers within the region chosen but now my pulldata doesn't work and the river ID won't automatically populate. Why is this?