Error

Hi All , 

can anyone help me to resolve this error 

Expression evaluation error [evaluation ID = X853UTXO] in rule 'testtable_write' at function a!textField [line 8]: Invalid index: Cannot index property 'name' of type Text into null value of type testTableR?list

a!formLayout(
label: "Test Table R",
contents: {
a!columnsLayout(
columns: {
a!columnLayout(
contents: {
a!textField(
label: "Name",
labelPosition: if(
ri!readOnly,
"ADJACENT",
"ABOVE"
),
value: ri!testTableR.name,
saveInto: ri!testTableR.name,
readOnly: ri!readOnly
),
a!dateField(
label: "Dob",
labelPosition: if(
ri!readOnly,
"ADJACENT",
"ABOVE"
),
value: ri!testTableR.dob,
saveInto: ri!testTableR.dob,
readOnly: ri!readOnly
),
a!integerField(
label: "Age",
labelPosition: if(
ri!readOnly,
"ADJACENT",
"ABOVE"
),
value: ri!testTableR.age,
saveInto: ri!testTableR.age,
readOnly: ri!readOnly
)
}
),
a!columnLayout(
contents: {
a!textField(
label: "Phno",
labelPosition: if(
ri!readOnly,
"ADJACENT",
"ABOVE"
),
value: ri!testTableR.phno,
saveInto: ri!testTableR.phno,
readOnly: ri!readOnly
),
a!floatingPointField(
label: "Salary",
labelPosition: if(
ri!readOnly,
"ADJACENT",
"ABOVE"
),
value: ri!testTableR.salary,
saveInto: ri!testTableR.salary,
readOnly: ri!readOnly
)
}
)
}
)
},
buttons: a!buttonLayout(
primaryButtons: {
a!buttonWidget(
label: "Submit",
submit: true,
style: "PRIMARY"
)
},
secondaryButtons: {
a!buttonWidget(
label: "Cancel",
value: true,
saveInto: ri!cancel,
submit: true,
style: "NORMAL",
validate: false
)
},
showWhen: or(
isnull(
ri!readOnly
),
not(
ri!readOnly
)
)
)
)