Prior to configuring a database to use Automatic Storage Management (ASM), you must install and configure Grid Infrastructure, which includes ASM software.
Grid Infrastructure can be installed from the separate installation media included in your media pack. Alternatively, it can be downloaded separately from Electronic Product Delivery (EPD) or the Oracle Technology Network (OTN). This is typically installed as a separate operating system user than the Oracle database and may have been installed by your system administrator. See the installation guide for more details.
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http://docs.oracle.com/cd/E16655_01/server.121/e26079/common_errormessages.htm
https://community.oracle.com/message/4216936
https://community.oracle.com/message/9608221