When officials asked for the Welsh translation of a road sign, they thought the reply was what they needed.
Unfortunately, the e-mail response to Swansea council said in Welsh: "I am not in the office at the moment. Please send any work to be translated".
So that was what went up under the English version which barred lorries from a road near a supermarket.
"When they're proofing signs, they should really use someone who speaks Welsh," said journalist Dylan Iorwerth.
It's good to see people trying to translate but they should really ask for expert help
Dylan Iorwerth, Golwg magazine
All official road signs in Wales are bilingual, so the local authority e-mailed its in-house translation service for the Welsh version of: "No entry for heavy goods vehicles. Residential site only".
The reply duly came back and officials set the wheels in motion to create the large sign in both languages.
The notice went up and all seemed well - until Welsh speakers began pointing out the embarrassing error.
The sign was lost in translation - and is now missing from the roadside
Managing editor Mr Iorwerth said: "We've been running a series of these pictures over the past months.
"They're circulating among Welsh speakers because, unfortunately, it's all too common that things are not just badly translated, but are put together by people who have no idea about the language.
"It's good to see people trying to translate, but they should really ask for expert help.
"Everything these days seems to be written first in English and then translated.
"Ideally, they should be written separately in both languages."
A council spokeswoman said : "Our attention was drawn to the mistranslation of a sign at the junction of Clase Road and Pant-y-Blawd Road."We took it down as soon as we were made aware of it and a correct sign will be re-instated as soon as possible."
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