转换时报如下错误：ORA-12516: TNS:listener could not find available handler with matching protocol stack

[dreamyb110]

操作系统：win8.1 数据库：oracle11.2.0.1 mysql8.0.28 OracleSync2MySQL：OracleSync2MySQL-win-x64-v0.0.7

转换时报如下错误： level=fatal msg="select trim(',' from (xmlagg(xmlparse(content '"'||column_name||'"'||',') order by COLUMN_ID).getclobval())) from user_tab_columns where table_name='这是表名' exec failed pool=0xdd8bf9bef0 stats=busy=123 open=123 max=0 maxLifetime=0s timeout=5m0s waitTimeout=0s params={authMode:0 connectionClass: connectionClassLength:0 purity:0 newPassword: newPasswordLength:0 appContext: numAppContext:0 externalAuth:0 externalHandle: pool:0xdd8bf9bef0 tag: tagLength:0 matchAnyTag:0 outTag: outTagLength:0 outTagFound:0 shardingKeyColumns: numShardingKeyColumns:0 superShardingKeyColumns: numSuperShardingKeyColumns:0 outNewSession:0}: ORA-12516: TNS:listener could not find available handler with matching protocol stack" func=OracleSync2MySQL/cmd.prepareSqlStr file="C:/go/src/OracleSync2MySQL/cmd/root.go:319"

请问这个如何解决，谢谢！