MySQL - Alter Table Fails As Workbench Tries To Create Existing Table

I have been trying to add another column to a table in my database using MySQL Workbench. This generates an 'ALTER TABLE' command which then fails as it fails attempting a 'CREATE TABLE, which it should not be doing as the table already exists! The output is below:-

ERROR 1114: The table 'Analysis' is full
SQL Statement:
ALTER TABLE `Patient`.`Analysis` ADD COLUMN `TestDateTime` DATETIME
NULL AFTER `idResults`

ERROR: Error when running failback script. Details follow.

ERROR 1050: Table 'Patient' already exists
SQL Statement:
CREATE TABLE `Patient` (
`idAnalysis` int(11) NOT NULL,
`idResults` int(11) DEFAULT NULL,
`ResultPDF` mediumblob,
`ResultCSV` mediumblob
) ENGINE=InnoDB DEFAULT CHARSET=latin1

How can I add this extra column as this database will evolve over time as user requirements expand?

Thank you.