The game crashed whilst initializing game Error:...

We do not have enough information to find the cause of this issue.

Please attach the crash report found in [minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/guides/finding-minecraft-data-folder] here.
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Duplicate of MC-12949

Assign more RAM to the Java Virtual Machine.
Launcher -> Profile Editor -> Edit Profile -> JVM Arguments -> Change -Xmx1G to -Xmx2G (or higher)

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📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki

crash-2018-02-25_18.50.12-client.txt attached..

Where is this edit profile button?

Go to "Käynnistysasetukset", then click the corresponding profile, and in "JVM argumentit", set the part which starts with "-Xmx" to "-Xmx2G" (or higher)

Yes! Its working, thanks!