Windows MUI error after weather unsafe [solved]

[TRAPPIST]

[edit: Find the solution in this message later in the thread.]

Hello Bob,

Most of the time after a weather alert is issued to close the observatory I get a script error in ACP.
The observatory is closed and safe , dome closed and parked,
we had a spike of humidity yesterday at 00:17:49 and weather unsafe was issued and dome closed.
Is it a normal behaviour ? telesocpe and CCD stays on and cooled (which is ok if observatory would need to be reopen after)
Here is part of the log :

00:16:28 === Place in plan ===
00:16:28 Set 1 of 1
00:16:28 Target is "TRAPPIST-1" (1 of 1)
00:16:28 Repeat 1 of 1 for this target
00:16:28 Filter I+z (1 of 1)
00:16:28 Image 107 of 1000 for this filter
00:16:28 Imaging to TRAPPIST-1-S001-R001-C107-I+z
00:16:28 (taking 50 sec. exposure, I+z filter, binning = 1)
00:16:29 (starting exposure)
00:17:24 (exposure complete)
00:17:26 (exposure complete and image downloaded)
00:17:27 Image finished
00:17:27 Plate-solve final image
00:17:28 394 image stars found
00:17:28 64 catalog stars found
00:17:29 Solved! 8 stars matched.
00:17:29 Average residual is 0.22 arcsec.
00:17:29 Pointing error is 0.025 arcmin @ angle 100.37
00:17:29 True focal length is 4730.6 mm.
00:17:29 True binned plate scales (arcsec/pix): H = 0.59 V = 0.59
00:17:29 True image center (J2000): 23h 06m 29.1s -05° 02' 28.27"
00:17:29 Imager sky position angle is 357.4 deg.
00:17:29 Image FWHM is 1.6 arcsec (2.80 pixels)
00:17:29 (avg FWHM = 1.51 arcsec)
00:17:29 [flip check: Tn=0s HAc=-2993s GW=F HAz=-2993s DWz=F WF=no]
00:17:29 Re-slew to target.
00:17:29 Start slew to TRAPPIST-1...
00:17:36 (wait for slew to complete)
00:17:37 (slew complete)
00:17:37 [flip check: Tn=50s HAc=-2985s GW=F HAz=-2935s DWz=F WF=no]
00:17:37 === Place in plan ===
00:17:37 Set 1 of 1
00:17:37 Target is "TRAPPIST-1" (1 of 1)
00:17:37 Repeat 1 of 1 for this target
00:17:37 Filter I+z (1 of 1)
00:17:37 Image 108 of 1000 for this filter
00:17:37 Imaging to TRAPPIST-1-S001-R001-C108-I+z
00:17:37 (taking 50 sec. exposure, I+z filter, binning = 1)
00:17:38 (starting exposure)
00:17:54 CloudSensorII: Weather is unsafe!
Cloud sensor is not ready or broken
00:17:56 **WEATHER ALERT: The weather has become unsafe!
00:17:56 **Script Error**
00:17:56 Source: ACP Observatory Control Software
00:17:56 Message: The script was interrupted before completion.
00:17:56 Location: line 1800 column 25.
00:17:56 Script Context:
00:17:56 1797: Tn.Dec, (lastImgOfTgt && rotNext), Tn.PA);
00:17:56 1798: }
00:17:56 1799: }
00:17:56 => 1800: catch(e)
00:17:56 ^
00:17:56 1801: {
00:17:56 1802: Console.PrintLine("**Imaging error: " + e.description); // Log the error
00:17:56 1803: Tc.Stack = false; // Prevent trying to stack
00:17:56 -- end --
00:17:57 **Script Error**
00:17:57 ACP script error 0x80073AFC from ThinScript.ActiveScript:
Le chargeur de ressources n’a pas pu trouver le fichier MUI..
ACP console log closed 29-août-2016 00:17:57 UTC