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'list' object has no attribute 'split'

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I have the following code and i am getting the following error, i am not sure why because the code works in python window in ArcMap but it doesn't work as a Add-in tool. Any would be appreciated.

error
Code:

Traceback (most recent call last):
  File "C:\Users\talmeida\AppData\Local\ESRI\Desktop10.1\AssemblyCache\{BB229966-100D-4482-A3FE-B298BD262597}\AddPoints_addin.py", line 55, in onMouseDownMap
    add_fields = add_fields.split(';')
AttributeError: 'list' object has no attribute 'split'

Add-in tool code
Code:

import arcpy
import pythonaddins
import os
from arcpy import env

class Add_points(object):
    """Implementation for AddPoints_addin.Add_points (Tool)"""
    def __init__(self):
        self.enabled = True
        self.cursor = 3 # Can set to "Line", "Circle" or "Rectangle" for interactive shape drawing and to activate the onLine/Polygon/Circle event sinks.
    def onMouseDownMap(self, x, y, button, shift):

        fc = "TonyTwoWay.DBO.TT"
        workspace = r"C:\Users\talmeida\AppData\Roaming\ESRI\Desktop10.1\ArcCatalog\Connection to dsd15_sqlexpress.sde"
        arcpy.env.overwriteOutput = True
        #arcpy.ChangeVersion_management('TonyTwoWay.DBO.TT','TRANSACTIONAL','dbo.DEFAULT', "")
        # Start an edit session. Must provide the worksapce.
        edit = arcpy.da.Editor(workspace)

        # Edit session is started without an undo/redo stack for versioned data
        #  (for second argument, use False for unversioned data)
        edit.startEditing(True)

        # Start an edit operation
        edit.startOperation()

        list = []
        with arcpy.da.SearchCursor(fc, ["AddressID"]) as cursor:
            for row in cursor:
                try:
                    if "CC" in row[0]:
                        list.append(int(row[0].strip("CC"))) 
                except TypeError:
                    pass       
        del cursor

        list.sort()
        AddressID = list[-1] + 1
        AddressID = 'CC' + str(AddressID)

        row_values = [(x, y, (x, y), AddressID)]
        cursor = arcpy.da.InsertCursor(fc, ["X_Coord", "Y_Coord", "SHAPE@XY", "ADDRESSID"])

        for row in row_values:
            cursor.insertRow(row)
        del cursor
#####################################################
        fcTarget = "TonyTwoWay.DBO.TT"
        fcJoin = "testParcelsAdmint"
        add_fields = ["ACCOUNT","SiteNum","OwnerName","SiteAddres","SiteNumSfx","predir","StreetType","SubName"]

        # fix args
        if type(add_fields) != list:
            # from script tool
            add_fields = add_fields.split(';')

        # do not need this scratch file
        fcOutput = r'in_memory\temp_join'
        arcpy.SpatialJoin_analysis(fcJoin, fcTarget,fcOutput, 'JOIN_ONE_TO_MANY')


        # grab oid field from points
        oid_t = arcpy.Describe(fcTarget).OIDFieldName

        # init rowW and rowR
        curR = arcpy.SearchCursor(fcOutput)
        join_dict = dict([(r.JOIN_FID,[r.getValue(f) for f in add_fields]) for r in curR])
        del curR

        # Now update the new target
        curW = arcpy.UpdateCursor(fcTarget)
        for row in curW:
            t_oid = row.getValue(oid_t)
            if t_oid in join_dict:
                for f in add_fields:
                    row.setValue(f, join_dict[t_oid][add_fields.index(f)])
            curW.updateRow(row)
        del row, curW
        arcpy.AddMessage('Updated all records sucussefully')

 
        # Stop the edit operation.
        edit.stopOperation()

        # Stop the edit session and save the changes
        edit.stopEditing(True)       

        arcpy.RefreshActiveView()
        pass

This part of the code works in python window in Arcmap.
Code:

import arcpy
arcpy.env.overwriteOutput = True

fcTarget = "TonyTwoWay.DBO.TT"
fcJoin = "testParcelsAdmint"
add_fields = ["ACCOUNT","SiteNum","OwnerName","SiteAddres","SiteNumSfx","predir","StreetType","SubName"]

# fix args
if type(add_fields) != list:
    # from script tool
    add_fields = add_fields.split(';')

# do not need this scratch file
fcOutput = r'in_memory\temp_join'
arcpy.SpatialJoin_analysis(fcJoin, fcTarget,fcOutput, 'JOIN_ONE_TO_MANY')


# grab oid field from points
oid_t = arcpy.Describe(fcTarget).OIDFieldName

# init rowW and rowR
curR = arcpy.SearchCursor(fcOutput)
join_dict = dict([(r.JOIN_FID,[r.getValue(f) for f in add_fields]) for r in curR])
del curR

# Now update the new target
curW = arcpy.UpdateCursor(fcTarget)
for row in curW:
    t_oid = row.getValue(oid_t)
    if t_oid in join_dict:
        for f in add_fields:
            row.setValue(f, join_dict[t_oid][add_fields.index(f)])
    curW.updateRow(row)
del row, curW
arcpy.AddMessage('Updated all records sucussefully')


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