Error detected while processing function <SNR>15_Count:

After running `<,`, `>,`, `[,`, or `],`, I get the following error:

```
Error detected while processing function <SNR>15_Count:
E121: Undefined variable: v:operator
E15: Invalid expression: v:operator
```

The argument switch still ends up working for me though (after pressing enter to rid the error).
I am on vim 7.0.237. Is this version of vim even supported?
