项目管理中复制项目报错，如何解决！

在系统默认的“管理”-“项目”中有项目复制功能，在做完成一个项目任务结构后，点击复制后，报503错误，如下图所示：

error.log日志如下：
[Wed Apr 24 18:34:03.436749 2024] [proxy_http:error] [pid 3980:tid 1292] (OS 10060)由于连接方在一段时间后没有正确答复或连接的主机没有反应，连接尝试失败。 : [client 60.12.8.241:18288] AH01102: error reading status line from remote server 127.0.0.1:3001, referer: http://120.26.6.158/redmine/projects/30524hk242122/copy
[Wed Apr 24 18:34:03.436749 2024] [proxy:error] [pid 3980:tid 1292] [client 60.12.8.241:18288] AH00898: Error reading from remote server returned by /redmine/projects/30524hk242122/copy, referer: http://120.26.6.158/redmine/projects/30524hk242122/copy
[Wed Apr 24 18:34:08.745840 2024] [proxy_http:error] [pid 3980:tid 1280] (OS 10060)由于连接方在一段时间后没有正确答复或连接的主机没有反应，连接尝试失败。 : [client 3.224.220.101:29154] AH01102: error reading status line from remote server 127.0.0.1:3001
[Wed Apr 24 18:34:08.745840 2024] [proxy:error] [pid 3980:tid 1280] [client 3.224.220.101:29154] AH00898: Error reading from remote server returned by /redmine/activity
[Wed Apr 24 18:34:19.316158 2024] [proxy_http:error] [pid 3980:tid 1268] (OS 10060)由于连接方在一段时间后没有正确答复或连接的主机没有反应，连接尝试失败。 : [client 23.22.35.162:53959] AH01102: error reading status line from remote server 127.0.0.1:3001
[Wed Apr 24 18:34:19.316158 2024] [proxy:error] [pid 3980:tid 1268] [client 23.22.35.162:53959] AH00898: Error reading from remote server returned by /redmine/activity
[Wed Apr 24 18:34:27.280027 2024] [proxy_http:error] [pid 3980:tid 1272] (OS 10060)由于连接方在一段时间后没有正确答复或连接的主机没有反应，连接尝试失败。 : [client 3.224.220.101:26336] AH01102: error reading status line from remote server 127.0.0.1:3001
[Wed Apr 24 18:34:27.280027 2024] [proxy:error] [pid 3980:tid 1272] [client 3.224.220.101:26336] AH00898: Error reading from remote server returned by /redmine/activity
[Wed Apr 24 18:34:32.398689 2024] [proxy_http:error] [pid 3980:tid 1296] (OS 10060)由于连接方在一段时间后没有正确答复或连接的主机没有反应，连接尝试失败。 : [client 23.22.35.162:13065] AH01102: error reading status line from remote server 127.0.0.1:3001
[Wed Apr 24 18:34:32.398689 2024] [proxy:error] [pid 3980:tid 1296] [client 23.22.35.162:13065] AH00898: Error reading from remote server returned by /redmine/activity
[Wed Apr 24 18:34:40.978767 2024] [proxy_http:error] [pid 3980:tid 1284] (OS 10060)由于连接方在一段时间后没有正确答复或连接的主机没有反应，连接尝试失败。 : [client 3.224.220.101:32192] AH01102: error reading status line from remote server 127.0.0.1:3001
[Wed Apr 24 18:34:40.978767 2024] [proxy:error] [pid 3980:tid 1284] [client 3.224.220.101:32192] AH00898: Error reading from remote server returned by /redmine/activity