Why I'm getting this error all the time?

https://prnt.sc/l3crau

TypeError: Illegal value: 3 (not an integer) stake._stake_period = "3" action.data = {"_stake_account":"xxxxxxxxxxxx","_stake_period":"3","_staked":"100.6839 EDNA"} transaction.actions = [{"account":"ednazztokens","name":"stake","authorization":[{"actor":"xxxxxxxxxxxx","permission":"active"}],"data":{"_stake_account":"xxxxxxxxxxxx","_stake_period":"3","_staked":"100.6839 EDNA"}}]