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@kallivalli This is probably an indication of timing issues in your system. Requested time 1571467069.157320838 but the latest data is at time 0.000000000, when looking up transform from frame [odom] to frame [base_link]]. It's required to include () function returns the current date and time. You should check how your nodes are setting their timestamps.

t.header.stamp = current_time; This will help you to solve the issue.

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