After upgrading to JIRA Service Desk 3.2.x, Service Desk project’s navigation bar shows “Unable to render element due to an error”

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Minimum upgrade version is the problem

If you don’t have JIRA Service Desk 3.0 or JIRA 7.0, first upgrade to JIRA 7.0 and then JIRA Service Desk 3.0 (with the .obr file). Then, upgrade to JIRA 7.2 and JIRA Service Desk 3.2 (upgrading as usual from the JIRA UI).
Make sure you have JIRA 7.0. Then, upgrade to JIRA 7.2 and JIRA Service Desk 3.2.