InfluxDB Cloud 2.0 is a time series database as a service that can be prone to errors, especially for beginners. The most common error `specified column does not exist in table: _time` occurs when using aggregate functions like `count()`, `mean()`, or `median()` on columns without the `_time` column. To fix this, users should use `aggregateWindow()` instead of the raw function and preserve the `_time` column. Another error, `unsupported aggregate column type string`, happens when trying to apply aggregators on columns with string types; fixing this requires converting strings to numerical values using functions like `int()` or `float()`. The third error, `failed to initialize execute state: could not find bucket "bucket-name"`, is caused by accidentally including a whitespace in the bucket name. To fix this, users should use the Flux Query Builder and switch to the Flux Script Editor to verify their bucket exists without white spaces.