The method violates async execution rules.

Problem Explanation

Future methods require strict signatures and cannot be chained improperly.

Root Cause(s)

1. Non-static method

2. Unsupported parameter types

3. Called from another async context

Step-by-Step Solution

1. Mark method @future and static

2. Use primitive parameters only

3. Avoid calling from batch or future

Edge Cases & Variations

1. Apex is more flexible

2. Limits differ between async types

Common Mistakes to Avoid

1. Passing sObjects

2. Expecting immediate execution