Unless someone trashed the XmlSupport.dat file, the error co-occurs with object creation problem in log files. Typically, memory is full. Fast solution, reboot server. Slow solution find out why memory is full.
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Zhang Miaogeng's post seems strange, but he is right. The problem is a low-resource problem. Reboot AGS and it should be OK (until memory be full – and that's another problem)
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