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“Content is not allowed in prolog” when parsing perfectly valid XML on GAE

I've been beating my head against this absolutely infuriating bug for the last 48 hours, so I thought I'd finally throw in the towel and try asking here before I throw my laptop out the window. ...
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What are .a and .so files?

I'm currently trying to port a C application to AIX and am getting confused. What are .a and .so files and how are they used when building/running an application? ...
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How to find the most recent file in a directory using .NET, and without looping?

I need to find the most recently modified file in a directory. 11 Answers 11 ...
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Identifying and removing null characters in UNIX

I have a text file containing unwanted null characters (ASCII NUL, \0 ). When I try to view it in vi I see ^@ symbols, interleaved in normal text. How can I: ...
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pandas DataFrame: replace nan values with average of columns

I've got a pandas DataFrame filled mostly with real numbers, but there is a few nan values in it as well. 10 Answers ...
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What is the “N+1 selects problem” in ORM (Object-Relational Mapping)?

The "N+1 selects problem" is generally stated as a problem in Object-Relational mapping (ORM) discussions, and I understand that it has something to do with having to make a lot of database queries for something that seems simple in the object world. ...
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Why the switch statement cannot be applied on strings?

Compiling the following code and got the error of type illegal . 20 Answers 20 ...
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Format of the initialization string does not conform to specification starting at index 0

I have an ASP.NET application which runs fine on my local development machine. 23 Answers ...
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Get array of object's keys

I would like to get the keys of a JavaScript object as an array, either in jQuery or pure JavaScript. 7 Answers ...
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Why is volatile needed in C?

Why is volatile needed in C? What is it used for? What will it do? 18 Answers 18 ...