When I am checking ver it's there but when >> license('c​heckout','​MATLAB Coder') License checkout failed. License Manager Error -18 .FLEXnet Licensing error -18,147

I have matlab 2011 b installed with embedded coder and simulink coder. Please explain following output

>> ver

-------------------------------------------------------------------------------------

MATLAB Version 7.13.0.564 (R2011b)

MATLAB License Number: 655259

Operating System: Microsoft Windows 7 Version 6.2 (Build 9200)

Java VM Version: Java 1.6.0_17-b04 with Sun Microsystems Inc. Java HotSpot(TM) 64-Bit Server VM mixed mode

-------------------------------------------------------------------------------------

MATLAB Version 7.13 (R2011b)

Simulink Version 7.8 (R2011b)

Embedded Coder Version 6.1 (R2011b)

Fixed-Point Toolbox Version 3.4 (R2011b)

MATLAB Coder Version 2.1 (R2011b)

MATLAB Report Generator Version 3.11 (R2011b)

Simulink Coder Version 8.1 (R2011b)

Simulink Report Generator Version 3.11 (R2011b)

Simulink Verification and Validation Version 3.2 (R2011b)

Stateflow Version 7.8 (R2011b)

>> license('checkout','MATLAB Coder')

License checkout failed.

License Manager Error -18

Make sure the license file on the MATLAB client matches the license file of the license server and that the license server has been started properly.

Troubleshoot this issue by visiting:

http://www.mathworks.com/support/lme/R2011b/18

Diagnostic Information:

Feature: MATLAB Coder

License path: 27000@D-10886;C:\Users\prashantm7\AppData\Roaming\MathWorks\MATLAB\R2011b_licenses;C:\Program Files\MATLAB\R2011b\licenses\license.dat;C:\Program Files\MATLAB\R2011b\licenses\network.lic

FLEXnet Licensing error: -18,147.

ans =

0

>> license('checkout','Stateflow')

ans =

1

>> license('checkout','MATLAB Coder')

License checkout failed.

License Manager Error -18

Make sure the license file on the MATLAB client matches the license file of the license server and that the license server has been started properly.

Troubleshoot this issue by visiting:

http://www.mathworks.com/support/lme/R2011b/18

Diagnostic Information:

Feature: MATLAB Coder

License path: 27000@D-10886;C:\Users\prashantm7\AppData\Roaming\MathWorks\MATLAB\R2011b_licenses;C:\Program Files\MATLAB\R2011b\licenses\license.dat;C:\Program Files\MATLAB\R2011b\licenses\network.lic

FLEXnet Licensing error: -18,147.

ans =

0