Water mark "Flex Data Visualization Trial" in Flash builder 4.7

Hi,

I am currently using Flash builder 4.7 and sdk 3.2 A . Recently a watermark started comingup on my screen. I searched for solution in Adobe forum and I tried the following approach,

Adding the lines in the flex-config.xml,

<licenses>

  <license>

  <product>flexbuilder3</product>

  <serial-number>1111-1111-1111-1111-1111-1111</serial-number>

  </license>

  </licenses>

Replacing the serial number with mine. Still the issue is not resolved. Could anyone help me in this, And also anyone please help me in finding the serial number as I am not sure the number I found is the way to find it or not.

Any response is most appreciated!

Thanks,

Mounika