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I don't understand what the -301 error means when trying to write a field to ThingSpeak. I checked my key and my write ID is OK ... The same program on another Arduino Mega and shield W5100 (but on another channel) works well ... Does anyone have any idea what the meaning of this error code is to know in which direction to look! Thank you

code :

void thingspeak(float t, float h, float units, int lum, int TempInt){

ThingSpeak.setField(1, t);								
ThingSpeak.setField(2, h);								
ThingSpeak.setField(3, units);							
ThingSpeak.setField(4, lum);								
ThingSpeak.setField(5,TempInt);							
ThingSpeak.setStatus("Update OK: ");					

    /* écriture des champs dans ThingSpeak */
  int x = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);			

if(x == 200){										
  Serial.println(F("Update of ThingSpeak ok."));				

              } 									
  else err(6,x);									// error handling

                                                   		   }        		// end of function thingspeak