This error occurs winter'15 release.when you integrate WSDL over .net application
How you solve this one Please find the below steps.
Step 1: Open the wsdl file.
Step:2 Find ListViewRecord
  1. <complexType name="ListViewRecord">
  2. <sequence>
  3. <element name="columns" type="tns:ListViewRecordColumn" maxOccurs="unbounded"/>
  4. </sequence>
  5. </complexType>
Step 3: Add "<xsd:attribute name="tmp" type="xsd:string" />".
Over this section
  1. <complexType name="ListViewRecord">
  2. <sequence>
  3. <element name="columns" type="tns:ListViewRecordColumn" maxOccurs="unbounded"/>
  4. </sequence>
  5. <xsd:attribute name="tmp" type="xsd:string" />
  6. </complexType>
Step 4: Update the webservice.
Now build the application its working like champ.

Enjoy.
Thanks