XML Error

I have done an xml application so far wrks!!! but when i add a new customer and go to process their meter gives me error

Fatal error: Call to a member function appendChild() on a non-object in C:\xampplite\htdocs\final_dwax\processmeter.php on line 83

it only when i add new customer from the application its not picking it up????
but when i hard code it in the xml file theirs no probs but thats not very useful.
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bobby101Author Commented:
uploaded file ZIP
bobby101Author Commented:
got rid of the .htaccess
bobby101Author Commented:
Also it does pick up the customer id from new customer that was adding using the application in bill payment
bobby101Author Commented:
Problem solved the error was in adding customers

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