Type Error: self.text

Question

After learned about new changes in blender API, I had to update script from 2.8 into 3.0 using : instead of =.

So following the changes in this script to 3.0...

class ALP_OT_Params(Operator):
 
   # Old 
   #text= bpy.props.StringProperty(name= "Enter Object Name", default= "")

   # Update
   text: bpy.props.StringProperty(name= "Enter Object Name", default= "")
   
   def excute(self,context):

     new_obj_name = self.text
     obj = bpy.context.object
     obj.name = new_obj_name

I am getting type error at this string obj.name = new_obj_name.

From blender console, The error stating...

TypeError: bpy_struct: item.attr = val: Object.name expected a bytes type, not str

I am not exactly sure what error was, but I am assuming it have something to do with changes in this string text:. I didn't have problem or getting any error on text= before Before Blender made API changes. What am I missing?

Couldn't find any information around that might help me to resolve my issues any suggestions?

UPDATE: Full script requested by @Gorgious & @Marty Fouts

import bpy
from bpy.types import Operator
from bpy.props import StringProperty

class ALP_OT_Params(Operator):
    """Opens Add Cube with New name Dialog Box"""
    bl_idname = "alp.ot_params"
    bl_label = "Add Cube Popup Dialog"

    text: StringProperty(name="Enter Text", default="")

    @classmethod
    def poll(cls, context):
        return True

    def execute(self, context):

        new_obj_name = self.text

        bpy.ops.mesh.primitive_cube_add()
        obj = bpy.context.object
        obj.name = new_obj_name

        return {"FINISHED"}

    def invoke(self, context, event):

        return context.window_manager.invoke_props_dialog(self)


 def register():
     bpy.utils.register_class(ALP_OT_Params)


 def unregister():
     bpy.utils.unregister_class(ALP_OT_Params)


 if __name__ == "__main__":
     register()
     bpy.ops.alp.ot_params('INVOKE_DEFAULT')

ERROR

UPDATE: File from Blender 3.1.0

Answer 1

So the code in your example has never been run, because if it had, it would have given an error message about the bl_idname. When I modify the bl_idname, it still won't run because there's no scale property. When I disable the reference to self.scale, it runs fine. Here's working code:

import bpy
from bpy.types import Operator
from bpy.props import StringProperty

class ALP_OT_Params(Operator):
    """Opens Add Cube with New name Dialog Box"""
    bl_idname = "alp.params"
    bl_label = "Add Cube Popup Dialog"
    text: StringProperty(name="Enter Text", default="")

    @classmethod
    def poll(cls, context):
        return True

    def execute(self, context):
        new_obj_name = self.text
        #scale_nbr = self.scale
        bpy.ops.mesh.primitive_cube_add()
        obj = bpy.context.object
        obj.name = new_obj_name
        return {"FINISHED"}

    def invoke(self, context, event):
        return context.window_manager.invoke_props_dialog(self)


def register():
    bpy.utils.register_class(ALP_OT_Params)


def unregister():
    bpy.utils.unregister_class(ALP_OT_Params)


if __name__ == "__main__":
    register()
    bpy.ops.alp.params('INVOKE_DEFAULT')