getting error while using search in Web portal


Upon using search in Web Portal, i am getting following error message.


An exception has occurred while executing the form method F1_ctl00_ControlRef8_ControlRef15_ControlRef15_ControlRef8b_Main_Main_ObjectSwitchContainer1_GridBand1_gridLoader_ctl02_GridSearchBox.
One or more errors occurred.
One or more errors occurred.
Application server returned an error.
Internal Server Error
Type definitions should start with a '{', expecting serialized type 'ErrorResponse', got string starting with: <!DOCTYPE html>
(2018-05-15 12:51:16)
Any pointers on what has gone wrong?
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