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MetaTrader error codes / MT5 Python package errors

MT5 Python error -7: Unsupported method (RES_E_UNSUPPORTED)

The terminal doesn't support the function you called. Update the terminal and package, or use a different call.

-7RES_E_UNSUPPORTED
NoSafe to retry?
Not a tradeCould it have executed?

What it means

You see this code in mt5.last_error() in Python, after a package call returns None or False.

-7 says the method isn't supported by the terminal on the other end. The package documentation gives only that short description.

It most often points at a version gap, or at a feature this terminal or server doesn't offer.

Common causes

  • A newer package function called against an older terminal.
  • A feature the broker's server doesn't provide.

How to fix it

  • Update the terminal and the package, then try again.
  • Check mt5.version() and test the call on a fresh install.
  • Fall back to another function that gives the same data.

Example in Python:

import MetaTrader5 as mt5

if mt5.market_book_add("EURUSD"):
    book = mt5.market_book_get("EURUSD")
    mt5.market_book_release("EURUSD")
else:
    print("market depth not available:", mt5.last_error())

Is it safe to retry?

Not as is. The same call fails the same way.

Could the order have executed?

Not a trade. Nothing was done.

Without the Python package

With Tickwire your code calls a REST API from any operating system, so this package error doesn't come up. See the MT5 Python API page.

All MetaTrader error codes

All MetaTrader5 Python functions

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