Creating a Maya UI

Question

Hi all, I am creating a maya UI but when I try to run my loadobject button command twice after I run my replace_name button once in maya I get this error:

cmds.textFieldButtonGrp(self.loadobject, e=True, text=select_objects[0])
RuntimeError:

Hope someone could help me fix this. Thanks.

import maya.cmds as cmds


class MyUI:
    def __init__(self):
        self.title = "Test UI"
        self.window = cmds.window(self.title, widthHeight=(1000, 600),
                         resizeToFitChildren=1)

        cmds.rowLayout("button1, button2, button3", numberOfColumns=5)

        cmds.columnLayout(adjustableColumn=True, columnAlign="center",
                      rowSpacing=10)
        self.loadobject = cmds.textFieldButtonGrp(label="Load Object name",
                                                  buttonLabel="Load",
                                                  text="Select Object %s."
                                                  % "and Load name",
                                                  buttonCommand=self.load)
        self.basename = cmds.textFieldButtonGrp(label="Basename",
                                                buttonLabel="Rename",
                                                text="Enter basename.",
                                                buttonCommand=self.replace_name)
        cmds.setParent(menu=True)

        cmds.showWindow(self.window)

    def load(self, *args):
        select_objects = cmds.ls(selection=True)
        cmds.textFieldButtonGrp(self.loadobject, e=True, text=select_objects[0])


    def replace_name(self, *args):
        self.loadobject = cmds.textFieldButtonGrp(self.loadobject,
                                               q=True, text=True)
        self.basename = cmds.textFieldButtonGrp(self.basename,
                                             q=True, text=True)
        name = cmds.rename(self.loadobject, self.basename)
        ctlname = "%s_ctl" % name
        self.new_name = cmds.rename(name, ctlname)