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There could be several reasons why an error occurs while attempting to run an already existing Jmeter script within a Maven project that is coded in groovy using Jsr223 sampler such as:

1. Incorrect syntax: The groovy code used in the Jsr223 sampler may contain syntax errors which can cause the script to fail during execution.

2. Missing dependencies: The Maven project may not have all the required dependencies installed which can lead to runtime errors.

3. Incorrect Jmeter version: The Jsr223 sampler used in the groovy code may be incompatible with the version of Jmeter being used.

4. Incorrect configuration: The Jmeter script may not be configured correctly which can cause the sampler to fail during execution.

5. Network issues: If the Jmeter script involves communicating with external services or APIs, network issues like connectivity problems can lead to errors during execution.

6. Performance issues: The Jmeter script may not be optimized for performance which can cause issues during load testing.