unable to install for the first time

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I'm trying to install concrete5 on a new website, for the first time. It gets about 1/3 of the way through and I get the following error message:

An exception occurred while executing 'INSERT INTO BlockTypes (btIgnorePageThemeGridFrameworkContainer, btHandle, btName, btDescription, btCopyWhenPropagate, btIncludeAll, btIsInternal, btSupportsInlineEdit, btSupportsInlineAdd, btInterfaceHeight, btInterfaceWidth, pkgID) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)' with params [0, "core_area_layout", "Area Layout", "Proxy block for area layouts.", 0, 0, 1, 1, 1, "400", "400", 0]: SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry 'core_area_layout' for key 'btHandle'.