Error: Could not find or load main class net.minecraft.client.main.Main

22:03:23.267
Preparing to launch minecraft client for 1.15.1
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Checking installations.
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Minecraft client 1.15.1 requires 15518397 bytes to download.
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Starting!
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Downloaded https://launcher.mojang.com/v1/objects/8b11614bea9293592a947ea8f4fd72981ea66677/client.jar to C:\Users\Sławek\AppData\Roaming\.minecraft\versions\1.15.1\1.15.1.jar
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TIMER: Downloads took 4 seconds.
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Using default game log configuration client-1.12.xml (outputs XML)
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Error: Could not find or load main class net.minecraft.client.main.Main
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Process crashed with exit code 1