<?xml version="1.0" encoding="UTF-8"?>
<methodResponse>
<fault>
<value>
<struct>
<member><name>faultCode</name>
<value><i4>4</i4></value></member>
<member><name>faultString</name>
<value>DatabaseErrorQuery took too long and was cancelled</value>
</member>
</struct>
</value>
</fault>
</methodResponse>
What is the cause of this error message?