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There are several possible reasons why MongoDB may experience a memory error when choosing a plan:

1. Insufficient memory: MongoDB requires a certain amount of memory to operate efficiently, and if your server does not have enough memory, it may encounter memory errors.

2. Large data set: If you have a large data set, MongoDB may require more memory to process queries efficiently. If your server cannot allocate enough memory to handle the data set, it may result in memory errors.

3. Poorly optimized queries: If you have poorly optimized queries, MongoDB may consume more memory than necessary, leading to memory errors. Inefficient indexes, joins, and aggregations can all contribute to memory issues.

4. Multiple database connections: If there are multiple database connections open at the same time, each connection will consume a certain amount of memory. If there are too many connections, it can lead to memory errors.

5. Memory leaks: Memory leaks can also cause memory errors in MongoDB. A memory leak occurs when a program continuously allocates memory but does not free up the memory when it is no longer needed. Over time, this can cause the program to run out of memory.

In summary, MongoDB may experience memory errors when choosing a plan if there is insufficient memory, a large data set, poorly optimized queries, multiple database connections, or memory leaks.