Launching 1.12.2

Fatal error launching game. Report this to http://bugs.mojang.com please!
java.lang.RuntimeException: Classpath file not found: C:\Users\Private\AppData\Roaming\.minecraft\ms-starter.jar
at net.minecraft.launcher.game.MinecraftGameRunner.constructClassPath(MinecraftGameRunner.java:392) ~[launcher_mcpatched.jar:1.6.84-j]
at net.minecraft.launcher.game.MinecraftGameRunner.createArgumentsSubstitutor(MinecraftGameRunner.java:299) ~[launcher_mcpatched.jar:1.6.84-j]
at net.minecraft.launcher.game.MinecraftGameRunner.launchGame(MinecraftGameRunner.java:168) ~[launcher_mcpatched.jar:1.6.84-j]
at com.mojang.launcher.game.runner.AbstractGameRunner.onDownloadJobFinished(AbstractGameRunner.java:186) [launcher_mcpatched.jar:1.6.84-j]
at com.mojang.launcher.updater.download.DownloadJob.popAndDownload(DownloadJob.java:122) [launcher_mcpatched.jar:1.6.84-j]
at com.mojang.launcher.updater.download.DownloadJob.access$000(DownloadJob.java:12) [launcher_mcpatched.jar:1.6.84-j]
at com.mojang.launcher.updater.download.DownloadJob$1.run(DownloadJob.java:86) [launcher_mcpatched.jar:1.6.84-j]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_151]
at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_151]
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:1.8.0_151]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:1.8.0_151]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_151]