Issues with a!PickerFieldUsers() function

Hello,

I have a requirement to build up a dynamic form based on the CDT we receive from API call. On the basis of keyAttribute value we are displaying the various controls. Now what i'm doing is I'm displaying the controls and their default values from the CDT received and saving the values to another CDT. Every other controls are working fine but with a!pickerFieldUser() funciton i'm getting errors. Below is the code I'm using

load(
local!tempUservalue:if(or(isnull(ri!defDataContentMetrics_cdt[ri!index].FormAttributeValue),
len(ri!defDataContentMetrics_cdt[ri!index].FormAttributeValue)=0),
null,
ri!defDataContentMetrics_cdt[ri!index].FormAttributeValue
),

with(
a!pickerFieldUsers(
label:ri!defDataContentMetrics_cdt[ri!index].ContentMetric,
lablePosition: "ABOVE",
maxSelections: 1,
value: local!tempUserValue,
saveInto: {
local!tempUserValue,
a!save(
ri!defDataContentMetrics_cdt[ri!index].FormAttributeValue,
if(
or(
isnull(save!value),
len(save!value) = 0
),
null,
save!value
)
),

a!save(
ri!ContentMetricsUpdatedValue_cdt[ri!index].FormAttributeValue,
if(
or(
isnull(save!value),
len(save!value) = 0
),
null,
save!value 
)
)
},
required: if(ri!defDataContentMetrics_cdt[ri!index].Required=1,true,false)
)

)
),

Where defDataContentMetrics_cdt is fetching values from API Call and ContentMetricsUpdatedValue_cdt is used to store the values. Can somebody tell me what is wrong inside the code?