detect error messages in .err file ?!?!

Dear all, It's the first time I get the following error in .ERR file:

"detect: histogram overflow ..." as you can see in the attached file.

I always used the following construct without any problem... till now...

*============ REGISTRAZIONE DEGLI EVENTI ==========
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+.
..
* rilevamento da 0 1024 keV
*DETECT 0.0 0.0 1.024E-3 1.0 1.0LOW
* rilevamento da 1000 keV a 2024 keV
DETECT 0.0 1.E-3 2.024E-3 1.0 1.0HIGH

Sorry for the misalignment but I can't preserve the correct layout here.
WHATs 1, 2, 3, 5 and 6, were used.

Any ideas ???

Best regards

Alessandro