Unknown argument: -superDevMode

I recently tried to downgrade my app from 2.7 to 2.6. I am now getting the following error in the console and am not sure what to do. What I did was extract GWT source folder to C drive added the sdk via project setting/GWT. I did have an error with the servelt.jar. so I deleted it and used the option from right click to synchornize sdk or something like that.

Here is the full error.

Unknown argument: -superDevMode

Google Web Toolkit 2.6.1

DevMode [-[no]startServer] [-port port-number | "auto"] [-whitelist whitelist-string] [-blacklist blacklist-string] [-logdir directory] [-logLevel level] [-gen dir] [-bindAddress host-name-or-address] [-codeServerPort port-number | "auto"] [-server servletContainerLauncher[:args]] [-startupUrl url] [-war dir] [-deploy dir] [-extra dir] [-workDir dir] [-sourceLevel [auto, 1.6, 1.7]] module[s] 

where 

  -[no]startServer  Starts a servlet container serving the directory specified by the -war flag. (defaults to ON)

  -port             Specifies the TCP port for the embedded web server (defaults to 8888)

  -whitelist        Allows the user to browse URLs that match the specified regexes (comma or space separated)

  -blacklist        Prevents the user browsing URLs that match the specified regexes (comma or space separated)

  -logdir           Logs to a file in the given directory, as well as graphically

  -logLevel         The level of logging detail: ERROR, WARN, INFO, TRACE, DEBUG, SPAM, or ALL

  -gen              Debugging: causes normally-transient generated types to be saved in the specified directory

  -bindAddress      Specifies the bind address for the code server and web server (defaults to 127.0.0.1)

  -codeServerPort   Specifies the TCP port for the code server (defaults to 9997)

  -server           Specify a different embedded web server to run (must implement ServletContainerLauncher)

  -startupUrl       Automatically launches the specified URL

  -war              The directory into which deployable output files will be written (defaults to 'war')

  -deploy           The directory into which deployable but not servable output files will be written (defaults to 'WEB-INF/deploy' under the -war directory/jar, and may be the same as the -extra directory/jar)

  -extra            The directory into which extra files, not intended for deployment, will be written

  -workDir          The compiler's working directory for internal use (must be writeable; defaults to a system temp dir)

  -sourceLevel      Specifies Java source level (defaults to auto:1.7)

and 

  module[s]         Specifies the name(s) of the module(s) to host

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