move troubleshooting from tutorials to guides

qdrant-landing/content/documentation/guides/common-errors.md

@@ -0,0 +1,32 @@
+---
+title: Troubleshooting
+weight: 170
+aliases:
+  - ../tutorials/common-errors
+---
+
+# Solving common errors
+
+## Too many files open (OS error 24)
+
+Each collection segment needs some files to be open. At some point you may encounter the following errors in your server log:
+
+```text
+Error: Too many files open (OS error 24)
+```
+
+In such a case you may need to increase the limit of the open files. It might be done, for example, while you launch the Docker container:
+
+```bash
+docker run --ulimit nofile=10000:10000 qdrant/qdrant:latest
+```
+
+The command above will set both soft and hard limits to `10000`.
+
+If you are not using Docker, the following command will change the limit for the current user session:
+
+```bash
+ulimit -n 10000
+```
+
+Please note, the command should be executed before you run Qdrant server.