There was a issue with the SOQL query. The query was taking a longer time to execute and when it was crossing 120 seconds, it was giving time out error. i had to use some index fields in my query to narrow the query range. it worked for me.
Some times due to queries it takes lot of time to execute.
Try to refresh the page again and try after some time.
Using Debug Logs, see why it is taking so long time to execute the code, and analyze it.