UPDATE:
Now it worked because of this 3 Lines i have read about on this Homepage:
´´´
void setup() {
...
LMIC_setAdrMode(1);
LMIC_setLinkCheckMode(1);
LMIC_setClockError(MAX_CLOCK_ERROR * 1 / 100);
}
I dont now why but maybe someone can tell me why in all sketches the linkcheck is diabled and thats why i get this “no join” error?
see picture ( waiting rx windows ) what is waiting?
regards Marc 
And somebody know what this mean?