Database may be already in use: null. Possible solutions: close all other connection(s);

錯誤信息如下：Database may be already in use: null. Possible solutions: close all other connection(s); use the server mode[90020-199] 解決方法： 第一步：點擊關閉運行H2數據庫 第二步：重新啓動本程序

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