What JRE versions runs the java applet in https://iocletenders.gov.in?
Use JRE 7 update 73 in case it is only related to the applet error,
Make sure you use Internet Explorer and not Internet Edge.
After you install the Java Runtime environment 7 update 73 you will get some messages asking you to update your installed java version, you can ignore it.
After that, you can login to https://iocletenders.gov.in/, any messages to “Run” can be clicked yes or Run