[I can't download anyone modpacks]

HI!
When I go to download any modpack on the laucher this error appears and does not start the download
HELP

I HAVE TRIED TO UNINSTALL AND INSTALL EVERYTHING YOU CAN IMAGINE

Quote

[B#560] java.lang.NoClassDefFoundError: org/eclipse/aether/impl/DefaultServiceLocator$ErrorHandler
[B#560]     at net.technicpack.minecraftcore.install.tasks.HandleVersionFileTask.<init>(HandleVersionFileTask.java:60)
[B#560]     at net.technicpack.launcher.launch.Installer.buildTasksQueue(Installer.java:282)
[B#560]     at net.technicpack.launcher.launch.Installer$1.run(Installer.java:114)
[B#560]     at java.lang.Thread.run(Unknown Source)
[B#560] Caused by: java.lang.ClassNotFoundException: org.eclipse.aether.impl.DefaultServiceLocator$ErrorHandler
[B#560]     at java.net.URLClassLoader.findClass(Unknown Source)
[B#560]     at com.regexlab.j2e.Jar2ExeClassLoader.findClass(Unknown Source)
[B#560]     at java.lang.ClassLoader.loadClass(Unknown Source)
[B#560]     at java.lang.ClassLoader.loadClass(Unknown Source)
[B#560]     ... 4 more
[B#560] Unhandled Exception in Thread[Thread-48,6,main]

NOTEBOOK ACER
java: Version 8 Update 251
iNTEL CORE I5-8250U
8GB RAM