Hi, this exception can occur if the transaction is already expired when it arrives at the Steem node. This can happen if there are network delays longer than the expiration period, or if your system time is off. In both cases, increasing the expiration can potentially be a workaround here. For the system clock skew, a longer term solution is obviously to correct the local time settings.
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Thank you @stmdev. There was a system time skew(mismatch in system time and network time). I corrected it here in the code:
stm = Steem(node="https://api.steemit.com/",expiration=200,keys=["mypostingkey"])by changing expiration from previously 90 to 200.It's working now!!!
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