arcpy UpdateCursor throws exception on geoprocessing service?

I wrote Python code that changes the state of a feature by ID. I am not using a Python Toolbox (.pyt). I wrote a python script and added it into a standard toolbox (.tbx). Using ArcGIS Desktop everything is OK. But when I published this code as geoprocessing service, it throws an exception.

What can I do?

Code:

import arcpy
import sys

"""The source code of the tool."""
copyFromLayer="Database ConnectionsSBGIS@connection.sdeuser.FeatureClass"

try:
    arcpy.AddMessage("start working")
    id=arcpy.GetParameterAsText(0)
    state=arcpy.GetParameterAsText(1)
    stateId=int(state)
    count=0
    cursor= arcpy.UpdateCursor(copyFromLayer)
    arcpy.AddMessage("readed data")
    for row in cursor:
        if row.ID==id:
            arcpy.AddMessage("find row")
            row.STATEID=stateId
            cursor.updateRow(row)
            count=count+1


    arcpy.AddMessage("ok")
    arcpy.AddMessage("count of calculate rows = "+str(count))
    arcpy.SetParameterAsText(0,"Result")
    del cursor
except:
    arcpy.AddError("error")
    for er in arcpy.GetMessages():
        arcpy.AddError(er)

Edit:

I wrote all steps one by one ,

1. I created new toolbox and imported script that before I wrote,
2. runed script on ArcMap and script runed very well ,
3. I went to results panel and right click result and selected share as – Geoprocessing Service , after all published new service.

4. open service on web browser and filled input and executed job .
   finally I got this message

   esriJobMessageTypeInformative: Submitted.
   esriJobMessageTypeInformative: Executing...
   esriJobMessageTypeInformative: Executing (ParselStateChange): Script {A08A008E-0716-410A-A9E1-634DDD89B12D} 1
   esriJobMessageTypeInformative: Start Time: Mon Feb 01 13:05:21 2016
   esriJobMessageTypeInformative: Executing (Script): Script {A08A008E-0716-410A-A9E1-634DDD89B12D} 1
   esriJobMessageTypeInformative: Start Time: Mon Feb 01 13:05:21 2016
   esriJobMessageTypeInformative: Running script Script...
   esriJobMessageTypeInformative: start working
   esriJobMessageTypeError: error
   esriJobMessageTypeInformative: Completed script Script...
   esriJobMessageTypeError: Failed to execute (Script).
   esriJobMessageTypeInformative: Failed at Mon Feb 01 13:05:21 2016 (Elapsed Time: 0.00 seconds)
   esriJobMessageTypeError: Failed to execute (ParselStateChange).
   esriJobMessageTypeInformative: Failed at Mon Feb 01 13:05:21 2016 (Elapsed Time: 0.00 seconds)
   esriJobMessageTypeError: Failed.