I am really sorry if this is a duplicate.
So made a report some time ago about another bug with " and the mod responsed that you can use ' everytime and don't have to escape it.
This worked also a long time fine until I found this bug:
/give @a sign 1 0 {BlockEntityTag:{Text1:"{translate:'item.skull.name',color:'dark_red',clickEvent:{action:run_command,value:'/tellraw @a {text:'HI'}'}}",id:"Sign"}}
The part which is causing the error is {text:'HI'} and there especially the ' .
When you use instead \" it works fine...
So please Mojang(Microsoft ... ) developers could you please make it possible that you don't need to escape there anything with \ until you want to write " ?