java.lang.NullPointerException: This exception has no message.

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This exception has no message.
java.lang.NullPointerException:
at java.util.regex.Matcher.getTextLength(Unknown Source)
at java.util.regex.Matcher.reset(Unknown Source)
at java.util.regex.Matcher.(Unknown Source)
at java.util.regex.Pattern.matcher(Unknown Source)
at cn.nukkit.plugin.PluginManager.loadPlugins(PluginManager.java:189)
at cn.nukkit.plugin.PluginManager.loadPlugins(PluginManager.java:133)
at cn.nukkit.plugin.PluginManager.loadPlugins(PluginManager.java:125)
at cn.nukkit.plugin.PluginManager.loadPlugins(PluginManager.java:121)
at cn.nukkit.Server.(Server.java:380)
at cn.nukkit.Nukkit.main(Nukkit.java:65)

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