SOAP-ERROR: Parsing Schema: can't import schema from …

I'm getting the error,

SOAP-ERROR: Parsing Schema: can't import schema from'http://schemas.xmlsoap.org/soap/encoding/'

1. SOAP and xml-rpc modules are intstalled.
2. I have followed this Stack Overflow question and verified the WSDL.

3. I have commented

   <import namespace="http://schemas.xmlsoap.org/soap/encoding/" schemaLocation="http://schemas.xmlsoap.org/soap/encoding/" /> in /app/code/core/Mage/Api/etc/wsdl.xml.

Any other steps to be followed? Should I update php, php-soap? It's working fine with Windows.