Non-License Server:Unable to find valid license key, falling back to limited function

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Today I wanted to update our Server from 3.0.11.4 to the latest version. If I try to start the updated server I can't connect. Looking for the Problem I found following in the log files: "Unable to find valid license key, falling back to limited functionality" I tried with to start the old... Non-License Server:Unable to find valid license key, falling back to limited function