Well, it should work. I am assuming that you are trying to work through Brain Dump No. 15, "Creating Custom Automatic Schedule Tags" and that you realize it was written for ADT2, so the folder structure has changed quite a bit since then.
Based on the error messages you report, I would suggest navigating to your content file on the Custom tab of DesignCenter. Select your tag, right click and choose Edit... from the context menu to open the Create AEC Content Wizard dialog. On the first "page", make certain that you have "added" the Multi-View Block and all view blocks used by the Multi-View Block to the content file. If any are missing in the Content File list box on the right, add them by selecting them in the Current Drawing list box and selecting the Add>>> button. Then proofread your Custom Command string, to make certain that you have correctly entered the name of your Multi-View Block after the _SYMBOL option, and that there is one space between _SYMBOL and your Multi-View Block name and one space after the name and before the _LEADER option.
See the attached screen capture for a sample. The name highlighted in the Custom Command dialog is the Multi-View Block name for that content file. Sorry, but I do not seem to have worked through the circle schedule Brain Dump using ADT2004, so I can not use that tag as my example.
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David Koch
Autodesk Discussion Group Facilitator