## Error: initializing node error: cbor input had wrong number of fields
This happens when you are starting Lotus which has been compiled for one network, but it encounters data in the Lotus data folder which is for a different network, or for an older incompatible version.
The solution is to clear the data folder (see below).
Lotus will attempt to set up the file descriptor (FD) limit automatically. If that does not work, you can still configure your system to allow higher than the default values.
On most systems you can check the open files limit with:
```sh
ulimit -n
```
You can also modify this number by using the `ulimit` command. It gives you the ability to control the resources available for the shell or process started by it. If the number is below 10000, you can change it with the following command prior to starting the Lotus daemon:
Note that this is not persisted and that systemd manages its own FD limits for services. Please use your favourite search engine to find instructions on how to persist and configure FD limits for your system.
