Here is the procedure In the PIN Settings tab you can define a policy for the use of PINs for accessing a conference.
Step 1 In the Administrator interface, on the sidebar, click MCU (if not already selected).
Step 2 Click Services. Select the service you wish to configure and click Add.
The Automatic Service Definition dialog box appears.
Step 3 Click Advanced Management and Security.
The Management and Security interface appears.
Step 4 Click PIN Settings.
Step 5 Select Force conference PIN protection if you want user to enter a PIN when creating or entering a conference using this service.
Step 6 Select Do not to ask for conference PIN when dialing-out to invitees if you want only dial-in participants to enter the conference PIN.
Step 7 Click OK.
Then you don't get this error. Try it.
