VersionHistoryManager Gson deep reflection

[23:11:43 ERROR]: [Server thread/net.min.ser.v1_.MinecraftServer] Encountered an unexpected exception
java.lang.ExceptionInInitializerError: null
        at net.minecraft.server.v1_12_R1.DedicatedServer.init(DedicatedServer.java:178) ~[solarpaper-server-1.1.6.jar:?]
        at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:670) ~[solarpaper-server-1.1.6.jar:?]
        at java.lang.Thread.run(Thread.java:831) [?:?]
Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make field private java.lang.String com.destroystokyo.paper.VersionHistoryManager$VersionData.oldVersion accessible: module org.bukkit does not "opens com.destroystokyo.paper" to module com.google.gson
        at java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:357) ~[?:?]
        at java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297) ~[?:?]
        at java.lang.reflect.Field.checkCanSetAccessible(Field.java:177) ~[?:?]
        at java.lang.reflect.Field.setAccessible(Field.java:171) ~[?:?]
        at com.google.gson.internal.reflect.UnsafeReflectionAccessor.makeAccessible(UnsafeReflectionAccessor.java:44) ~[gson-2.8.6.jar:?]
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:159) ~[gson-2.8.6.jar:?]
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:102) ~[gson-2.8.6.jar:?]
        at com.google.gson.Gson.getAdapter(Gson.java:458) ~[gson-2.8.6.jar:?]
        at com.google.gson.Gson.toJson(Gson.java:696) ~[gson-2.8.6.jar:?]
        at com.google.gson.Gson.toJson(Gson.java:683) ~[gson-2.8.6.jar:?]
        at com.google.gson.Gson.toJson(Gson.java:658) ~[gson-2.8.6.jar:?]
        at com.destroystokyo.paper.VersionHistoryManager.writeFile(VersionHistoryManager.java:83) ~[solarpaper-api-1.1.6.jar:?]
        at com.destroystokyo.paper.VersionHistoryManager.<init>(VersionHistoryManager.java:71) ~[solarpaper-api-1.1.6.jar:?]
        at com.destroystokyo.paper.VersionHistoryManager.<clinit>(VersionHistoryManager.java:21) ~[solarpaper-api-1.1.6.jar:?]
        ... 3 more