Error: TypeError: Already read

I have created a drop down list with

<PowerSelect
          class="uk-select" id="form-ReadSecurity"
          @options={{this.secReadOptions}}
          @selected={{this.changeset.secLevel}}
          @onChange={{this.selectReadSecurity}} as |option|>
          {{option.description2}}
        </PowerSelect>

and whenever I change the option and try to save using the save button I am getting an error ‘Error: TypeError: Already read’ I have other drop down list too which is not created using but it is working fine.

Can anyone help me understand the issue. Thanks in advance!

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