Assign: Cannot create an L-value from the given expression with property 'set_Item' because the target object is null

Hi , i am unable to assign the data to datarow variable im getting below error please help me on this

you have to mach the data row with Data table then-only the data row will reference for the data table along with the columns.
u can use addDatarow. pass the array of values & data table name into add row activity.
it will work