Removing a Mail Universal Security Group failed

I tred to remove a Mail Universal Security Group created in error but I receive the message below.

I was relly trying to create a Mail Non-Universal group.

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Microsoft Exchange Error
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Action 'Remove' could not be performed on object '20_LaptopUsers'.

20_LaptopUsers
Failed
Error:
Active Directory operation failed on SERF02.Addington.Local. This error is not retriable. Additional information: Access is denied.
Active directory response: 00000005: SecErr: DSID-0315202A, problem 4003 (INSUFF_ACCESS_RIGHTS), data 0

The user has insufficient access rights.

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OK
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