how return value from subreport to mian report?

hi i am new in jasper report , i want to return value from subreport to main report , i make two variable with same name ,same class type callculation type (check one time system or one time nothing) but bu answer result null in main report please help me ..........

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Joined: Aug 13 2018 - 11:47am
Last seen: 2 years 3 months ago

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