Not possible to fund the channel

[rflament]

When clicking on "Fund the Channel", the message "You are now computing Proof of Work. This shouldn't take more than 15 seconds" stays there forever and there is an error in console :

Unhandled promise rejection 
Error: Request Error: Invalid API Version
Stack trace:
requestError@http://localhost:3000/_next/1513535484942/page/:32705:12
module.exports</makeRequest.prototype.prepareResult@http://localhost:3000/_next/1513535484942/page/:24856:13
module.exports</makeRequest.prototype.send/request.onreadystatechange@http://localhost:3000/_next/1513535484942/page/:24758:14

It comes from the response of the POST call on https://testnet140.tangle.works/ :

{"error":"Invalid API Version","duration":0}