ok!
special characters are are not allowed in lr.start_transaction.
like this:
lr.start_transaction("trans1-3333");
or like this:
lr.start_transaction("trans1+3333");
special characters are are not allowed in lr.start_transaction.
like this:
lr.start_transaction("trans1-3333");
or like this:
lr.start_transaction("trans1+3333");