PayPal module error

I’ve for the first time used a PayPal link to have client to pay. The payment went well, but I’ve received he email below and the payment is not registred in Dolibarr, I had to do that manually. Can anyone tell me what this is about?

The payment confirmation page called by the payment system returned an error

Technical information:
Online payment system: paypal
URL de retour de paiement: /xxxx/public/payment/paymentok.php?s=order&ref=BC300329&fulltag=ORD%3D244.CUS%3D17827.PM%3Dpaypal&securekey=7lZp7A760QX0b7cSyOB62FyoSaZe1srZ&e=1&token=EC-9XV27610WH089633T&PayerID=7WACDBHT8BHN2

tag=ORD=244.CUS=17827.PM=paypal
token=EC-9XV27610WH089633T
paymentType=
currencycodeType=
payerId=7WACDBHT8BHN2
ipaddress=
FinalPaymentAmt=

My system is in French so I’ve tried to translate to English.