And what must i do?

Why donot in work?: var roleMule = { run: function(creep) {

    if(creep.memory.mule && creep.store[RESOURCE_ENERGY] == 0) {
        creep.memory.muleing = false;
    }
    if(!creep.memory.mule && creep.store.getFreeCapacity() == 0) {
        creep.memory.muleing = true;
    }
    
    var targets = creep.room.find(FIND_STRUCTURES, {
        filter: (structure) => {
            return (structure.structureType == STRUCTURE_EXTENSION || structure.structureType == STRUCTURE_SPAWN || structure.structureType == STRUCTURE_TOWER) &&
            structure.store.getFreeCapacity() > 0;
        }
    }); 
    
    var containers = creep.room.find(STRUCTURE_CONTAINER, {
        filter: (structure) => {
            return (structure.structureType == STRUCTURE_CONTAINER) &&
            (structure.store[RESOURCE_ENERGY] > 0);
        }
    }); 
    
    if(creep.memory.muleing) 
    {
        if(targets.length > 0) {
            if(creep.transfer(targets[0], RESOURCE_ENERGY) == ERR_NOT_IN_RANGE) {
                creep.moveTo(targets[0]);
            }   
        }  
    }
        else 
    { 
        if(containers.length > 0) {
            if(creep.withdraw(containers[0], RESOURCE_ENERGY) == ERR_NOT_IN_RANGE) {
                creep.moveTo(containers[0]);
            }
        }
    }
}    

};

module.exports = roleMule;