<s>[INST] Here is a example of my code in Python:

```
import json

def load_json(json_file):
    try:
        with open(json_file, 'r') as f:
            return json.load(f)
    except FileNotFoundError:
        print(f"{json_file} not found")
        return None

def process_data(data):
    errors = 0
    for item in data:
        try:
            variable = item['variable']
            if variable not in ['a', 'b', 'c']:
                continue
            some_value = item['some_value']
            another_value = item['another_value']
        except KeyError as e:
            print(f"Error processing item {item}: {e}")
            errors += 1
            continue
        try:
            some_value *= another_value
            if some_value > 1000:
                print(f"Result too high for {item}: {some_value}")
                errors += 1
        except TypeError as e:
            print(f"Error processing item {item}: {e}")
            errors += 1
        print("Success")
    return errors

def main():
    json_file = 'data.json'
    data = load_json(json_file)
    if data is not None:
        errors = process_data(data)
        print(f"Total errors: {errors}")

if __name__ == "__main__":
    main()

```
I have a JSON file `data.json` with the following data:

```
[
    {"variable": "a", "some_value": 10, "another_value": 20},
    {"variable": "b", "some_value": 30, "another_value": "unknown"},
    {"variable": "c", "some_value": 40},
    {"variable": "d", "some_value": 50, "another_value": 60},
    {"variable": "a", "some_value": 70, "another_value": 80},
    {"variable": "b", "some_value": 90, "another_value": 100}
]
```
I am experiencing issues with this code. Sometimes it is processing the data successfully, but other times it is returning errors. The errors occur when the JSON file contains values that cannot be multiplied, for example when a value is a string, or when it is missing for a key.

My question is: How do I improve my code so that it can handle these errors?[/INST]