CRYPTBADWRTPOS, CRYPTBADWRTPOS, Encrypted WRITE disallowed from a position different than where the last WRITE completed
Run Time Error: A WRITE attempt to an encrypted device violates the integrity of the produced ciphertext. This is the case, for example, when trying to WRITE to a previously encrypted and CLOSEd file. Because encryption ciphers rely on state machine algorithms, GT.M prohibits WRITEs performed in non-sequential fashion or when they threaten to overlay already encrypted data.
Action: Revise your M code to avoid illegal I/O operations with encryption. Note, in particular, that when using encryption non-empty files cannot be opened in APPEND mode; the SEEK deviceparameter is prohibited; and the TRUNCATE is only permitted at the beginning or end of a file.
