delete test and add common-errors

doc/troubleshooting/common-errors.md

@@ -0,0 +1,31 @@
+# Common Errors
+(Errors are sorted alphabetically)
+
+## FileNotFoundError: [Errno 2] No such file or directory: '.../01.model_devi/graph.xxx.pb'
+If you find this error occurs, please check your initial data. Your model will not be generated if the initial data is incorrect.
+
+## json.decoder.JSONDecodeError
+Your `.json` file is incorrect. It may be a mistake in syntax or a missing comma.
+
+## RuntimeError: job:xxxxxxx failed 3 times
+```
+RuntimeError: job:xxxxxxx failed 3 times
+
+......
+
+RuntimeError: Meet errors will handle unexpected submission state.
+Debug information: remote_root==xxxxxx
+Debug information: submission_hash==xxxxxx
+Please check the dirs and scripts in remote_root. The job information mentioned above may help.
+```
+If a user finds an error like this, he or she is advised to check the files on the remote server. It shows that your job has failed 3 times, but has not shown the reason. 
+
+To find the reason, you can check the log on the remote root. For example, you can check train.log, which is generated by DeePMD-kit. It can tell you more details. 
+If it doesn't help, you can manually run the `.sub` script, whose path is shown in `Debug information: remote_root==xxxxxx`
+
+Some common reasons are as follows:
+1. Two or more jobs are submitted manually or automatically at the same time, and their hash value collide. This bug will be fixed in dpdispatcher.
+2. You may have something wrong in your input files, which causes the process to fail.
+
+## RuntimeError: find too many unsuccessfully terminated jobs.
+The ratio of failed jobs is larger than ratio_failure. You can set a high value for ratio_failure or check if there is something wrong with your input files.