when trying to escape my game will crash saying

Script 'BattleManager' line 218: ArgumentErroe occurred.
invalid value for Float(): "actor name"

this is line 218

$game_message.add(sprintf(Vocab::EscapeStart, $game_party.name))

can anyone help please.

It doesn't do it in a blank project, which means you are using scripts. You need to find which one causes the issue: remove them one by one until the problem disappears.

found out it was the vocab translation i used thanks for reply.