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This error is seen in cases what the SQL server 2014 Share Management Objects and CLR Types modules did not properly install. You can get them here:
Please note the most common instance of this being a problem is an attempt to install on SQL 2016. That version is not yet supported by ISM and even if you install those prereqs from the link above, you'll likely not be able to get 2017.3.1 working with the SSRS 2016 version. It should be fully supported in the very near future when the 2018.1.1 version is released.