Tell us what you are trying to do?
i try to activate plugins f.ex. code snippets pro and gets the error mesage "Plugin could not be activated because it triggered a fatal error." after dectivation of toolset types, everything works great again. all plugins and wordpress are up2date.
That will create a debug.log file in your /wp-content/ directory which you can examine in any text editor. Try re-activating plugins again that generate the error, and then inspect the log.
Let us know what it contains.
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