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To fix this:
First, run `cat` command on the file listed in the message. e.g:
```
~~cat /home/istiak/ruby/qpixel/tmp/pids/server.pid~~
```
`cat` command will return a 5 digit number. e.g
```
12345
```
`12345` is the PID of the process that is running the current rails server.
Then kill the running process using:
```
kill -9 12345
```
Then you can run the server using:
```
rails s
~~```~~
~~Hope this helps!~~

To fix this:
First, run `cat` command on the file listed in the message. e.g:
```
cat /home/XXX/ruby/YYY/tmp/pids/server.pid
```
`cat` command will return a 5 digit number. e.g
```
12345
```
`12345` is the PID of the process that is running the current rails server.
Then kill the running process using:
```
kill -9 12345
```
Then you can run the server using:
```
rails s
```