versehen mit
to provide with
To equip or furnish something or someone with something.
Das neue Modell ist mit zahlreichen Sicherheitsfunktionen versehen.
The new model is provided with numerous safety features.

to provide / to be mistaken
Loading your saved state.
to provide with
To equip or furnish something or someone with something.
Das neue Modell ist mit zahlreichen Sicherheitsfunktionen versehen.
The new model is provided with numerous safety features.

'Versehen' (to provide / to be mistaken) is an inseparable verb that comes from the stem 'sehen' (to see). The prefix 'ver-' here indicates either a mistake ('sich versehen' = to be mistaken) or the result of an action ('etwas mit etwas versehen' = to provide something with something).
Ich habe mich beim Datum versehen, das Treffen ist erst morgen.
I was mistaken about the date; the meeting is not until tomorrow.
In the meaning 'ausstatten' (to equip), 'versehen' is always used with the preposition 'mit' and the dative. The structure is: something is provided with something (dative).
Alle Dokumente müssen mit einer Unterschrift versehen sein.
All documents must be provided with a signature.
When 'versehen' is used reflexively ('sich versehen'), it always means 'to make a mistake' or 'to be mistaken'. It is often followed by a preposition such as 'in' or 'bei' to name the area of the mistake.
Ich habe mich in der Uhrzeit versehen und war eine Stunde zu früh da.
I was mistaken about the time and was there an hour too early.
The meaning 'to perform a duty or hold an office' is very formal and is used mainly in official or administrative language. In normal everyday life, you almost never hear this use.
Der Richter versieht sein Amt seit über zwanzig Jahren.
The judge has held his office for over twenty years.
to fulfill
'erfüllen' and 'versehen' can both have to do with a task or duty. 'erfüllen' is used when you do something that is expected, desired, or required, for example a duty, an assignment, or a wish. In this related sense, 'versehen' means that someone performs an office, a service, or a task. This use of 'versehen' is more formal and less common in everyday language. The words can be confused because both fit with responsibility. Usually, however, 'eine Aufgabe erfüllen' (to carry out a task) sounds more natural; 'ein Amt versehen' (to hold/perform an office) sounds more like administrative or official language.

Herr Kaya versieht seit Mai den Dienst am Empfang.
Mr. Kaya has been performing reception duty since May.
Sie erfüllt ihre Aufgaben im Projekt sehr zuverlässig.
She carries out her tasks in the project very reliably.