title: ReportLab - error when creating a table
body: <p>This is the first time I've used ReportLab, I have tried to edit an existing script that does exactly what I want to do, but I get the following error, when I try and run the script.</p>
  
  <p>Script - </p>
  
  <pre><code>import os, arcgisscripting, datetime, getpass, string
  
  from reportlab.lib.pagesizes import A4
  from reportlab.platypus import *
  from reportlab.lib import colors
  from reportlab.lib.styles import ParagraphStyle
  
  myWorkspace = r"W:\City.gdb"
  myReportFolder = r"W:\Reports"
  myLogosFolder = r"W:\Logos"
  OpenPDF = "true"
  
  gp = arcgisscripting.create(9.3)
  
  
  #setup geoprocessor
  gp.workspace = myWorkspace
  gp.toolbox = "analysis"
  gp.OverwriteOutput = 1
  mySelectedGroupsFC = myWorkspace + os.sep + "SelectedGroups"
  myNewBusinessFC = myWorkspace + os.sep + "New_Businesses"
  myBufferFC = myWorkspace + os.sep + "Buffer"
  myReportTable = myWorkspace + os.sep + "FINAL_TABLE"
  
  #obtain Selected groups
  mySelGroupsCursor = gp.searchcursor(mySelectedGroupsFC)
  mySelectedGroups = mySelGroupsCursor.next()
  
  #obtain New Business groups
  myNewBusinessCursor = gp.searchcursor(myNewBusinessFC)
  myNewBusiness = myNewBusinessCursor.next()
  
  #obtain Buffer
  myBufferCursor = gp.searchcursor(myBufferFC)
  myBuffer = myBufferCursor.next()
  
  #setup PDF doc
  Author = getpass.getuser() #gets OS user name
  pdf_file_name = myNewBusiness.POSTCODE
  pdf_file = myReportFolder + os.sep + pdf_file_name + ".pdf"
  
  doc = SimpleDocTemplate(pdf_file, pagesize=A4)
  
  #array of report elements
  parts = []
  
  #
  #HEADER
  #
  parstyle = ParagraphStyle(name='Title', fontName='Helvetica', fontSize=12, alignment=1, spaceAfter=20)
  p = Paragraph('&lt;b&gt;&lt;u&gt;Report&lt;/u&gt;&lt;/b&gt;', parstyle)
  parts.append(p)
  
  p = Paragraph('The following community groups are located within &lt;b&gt;&lt;u&gt;' + myBuffer.Buffer + 'metres  of -  &lt;b&gt;&lt;u&gt;' + myNewBusiness.Postcode + '&lt;\b&gt;&lt;\u&gt;.',parstyle)
  parts.append(p)
  
  #
  #TABLE
  #
  
  while myBuffer:
      parstyle = ParagraphStyle(name='Title', fontName='Helvetica', fontSize=11, alignment=0, spaceAfter=15, spaceBefore =15)
      p = Paragraph('&lt;b&gt;&lt;u&gt;Community groups within ' + myBuffer.Buffer + ' metres of ' + myNewBusiness.Postcode  + '&lt;/u&gt;&lt;\b&gt;', parstyle)
      parts.append(p)
  
      data = []
      parstyle = ParagraphStyle(name='Title', fontName='Helvetica', fontSize=11, alignment=0)    
  
      while mySelectedGroups:
          selectedGroups_desc = 'Community ID:'+ '&lt;i&gt;' + mySelectedGroups.Community_ID + '&lt;\i&gt;' + 'Organisation Name :' + mySelectedGroups.Organisation_Name  
          p = Paragraph(selectedGroups_desc, parstyle)
          mySelectedGroups = mySelGroupsCursor.next()
  
  
      #build and format table
      t=Table(data, colWidths=(100,100))
      t.setStyle(TableStyle([
          ('ALIGN',(0,0),(-1,-1),'CENTER'),
          ('VALIGN',(0,0),(-1,-1),'TOP'),
          ('INNERGRID', (0,0), (-1,-1), 0.25, colors.black),
          ('BOX', (0,0), (-1,-1), 0.25, colors.black),
          ('TOPPADDING', (0,0), (-1,-1), 10),
          ]))
      parts.append(t)
  
  myBuffer = myBufferCursor.next()
  
  #Footnote
  parstyle = ParagraphStyle(name='Title', fontName='Helvetica', fontSize=11, alignment=0, spaceAfter=15, spaceBefore=15)
  p = Paragraph('''Should you have any further questions **''', parstyle)
  parts.append(p)
  
  
  #Build document
  doc.build(parts)
  
  del mySelGroupsCursor, myNewBusinessCursor, myBufferCursor
  
  #Open document
  if OpenPDF == "true":
      os.startfile(pdf_file)
  </code></pre>
  
  <p>The error that I get is:</p>
  
  <pre><code>Traceback (most recent call last):
    File "C:\Python25\Lib\site-packages\Pythonwin\pywin\framework\scriptutils.py", line 325, in RunScript
      exec codeObject in __main__.__dict__
    File "H:\Report_v2.py", line 100, in &lt;module&gt;
      t=Table(data, colWidths=(100,100))
    File "C:\Python25\Lib\site-packages\reportlab\platypus\tables.py", line 236, in __init__
      raise ValueError("%s must have at least a row and column" % self.identity())
  ValueError: &lt;Table@0x010F4710 0 rows x unknown cols&gt;... must have at least a row and column
  </code></pre>
  
  <p>Any ideas what I need to do as I am struggling a bit.</p>
  
  <p>Thanks.</p>