com.wiredtiger.db.WiredTigerPackingException: Format mismatch. Wanted: U, got: r

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com.wiredtiger.db.WiredTigerPackingException: Format mismatch. Wanted: U, got: r
at com.wiredtiger.db.PackFormatInputStream.checkType(PackFormatInputStream.java:118)
at com.wiredtiger.db.PackInputStream.getByteArray(PackInputStream.java:130)
at com.wiredtiger.db.Cursor.getKeyByteArray(Cursor.java:302)
at com.wiredtiger.examples.ex_schema.schemaExample(ex_schema.java:199)
at com.wiredtiger.examples.ex_schema.main(ex_schema.java:391)

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