GWT 2.8 upgrade problem

[e.kousou]

chrome 56, GWT 2.8, SmartGWT v11.0p_2017-02-14/LGPL Development Only (built 2017-02-14)

Hello,
I have developed a site using GWT 2.7 and SmartGWT 6.0. Now i try to upgrade GWT to 2.8. I have also downloaded the latest nightly for SmartGWT. Everything compiles fine but when i try to see the site on the browser i get the following output that i cant debug. Any help would be more than welcome

*10:44:26.465:INFO:Log:initialized
isc.B.push.isc.A.addToMasterLog @ ISC_Core.js:1134
ISC_Core.js:1134 *10:44:27.081:INFO:Log:isc.Page is loaded
isc.B.push.isc.A.addToMasterLog @ ISC_Core.js:1134
ISC_Core.js:1134 *10:44:28.341:WARN:Log:TypeError: java.lang.NullPointerException
Stack from error.stack:
GTm_g$.JTm_g$(<no args: exited>) @ 904C07F03B6FC0CB524B26D7D3ED4862.cache.js:360146:21
GTm_g$.IXc_g$(<no args: exited>) @ 904C07F03B6FC0CB524B26D7D3ED4862.cache.js:114087:44
GTm_g$.pXc_g$(<no args: exited>) @ 904C07F03B6FC0CB524B26D7D3ED4862.cache.js:113844:95
GTm_g$.VXc_g$(<no args: exited>) @ 904C07F03B6FC0CB524B26D7D3ED4862.cache.js:114202:10
GTm_g$.bYc_g$(<no args: exited>) @ 904C07F03B6FC0CB524B26D7D3ED4862.cache.js:114273:10
GTm_g$.Rqd_g$(<no args: exited>) @ 904C07F03B6FC0CB524B26D7D3ED4862.cache.js:118928:75
GTm_g$.GTm_g$(<no args: exited>) @ 904C07F03B6FC0CB524B26D7D3ED4862.cache.js:360112:10
Mio_g$(<no args: exited>) @ 904C07F03B6FC0CB524B26D7D3ED4862.cache.js:380247:93
Xio_g$(<no args: exited>) @ 904C07F03B6FC0CB524B26D7D3ED4862.cache.js:380411:5
lVm_g$(<no args: exited>) @ 904C07F03B6FC0CB524B26D7D3ED4862.cache.js:3408:28
YWm_g$(<no args: exited>) @ 904C07F03B6FC0CB524B26D7D3ED4862.cache.js:4138:21
_b_g$.ec_g$(<no args: exited>) @ 904C07F03B6FC0CB524B26D7D3ED4862.cache.js:5555:7
Array.kwf_g$(<no args: exited>) @ 904C07F03B6FC0CB524B26D7D3ED4862.cache.js:146052:27
initializeModules_0_g$(<no args: exited>) @ 904C07F03B6FC0CB524B26D7D3ED4862.cache.js:43:95
Oxd_g$(<no args: exited>) @ 904C07F03B6FC0CB524B26D7D3ED4862.cache.js:120692:98
Rxd_g$(<no args: exited>) @ 904C07F03B6FC0CB524B26D7D3ED4862.cache.js:120784:41
<anonymous>(<no args: exited>) @ 904C07F03B6FC0CB524B26D7D3ED4862.cache.js:120742:25
Dvf_g$(<no args: exited>) @ 904C07F03B6FC0CB524B26D7D3ED4862.cache.js:57:105
<anonymous>(<no args: exited>) @ 904C07F03B6FC0CB524B26D7D3ED4862.cache.js:389913:46

isc.B.push.isc.A.addToMasterLog @ ISC_Core.js:1134
Adminlab-0.js:120790 Uncaught TypeError: java.lang.NullPointerException
at GTm_g$.JTm_g$ [as createError_0_g$] (Adminlab-0.js:360146:21)
at GTm_g$.IXc_g$ [as initializeBackingError_0_g$] (Adminlab-0.js:114087:44)
at GTm_g$.pXc_g$ (Adminlab-0.js:113844:95)
at GTm_g$.VXc_g$ (Adminlab-0.js:114202:10)
at GTm_g$.bYc_g$ (Adminlab-0.js:114273:10)
at GTm_g$.Rqd_g$ (Adminlab-0.js:118928:75)
at GTm_g$ (Adminlab-0.js:360112:10)
at Mio_g$ (Adminlab-0.js:380247:93)
at Xio_g$ (Adminlab-0.js:380411:5)
at lVm_g$ (Adminlab-0.js:3408:28)
at YWm_g$ (Adminlab-0.js:4138:21)
at _b_g$.ec_g$ [as onModuleLoad_0_g$] (Adminlab-0.js:5555:7)
at Array.kwf_g$ (Adminlab-0.js:146052:27)
at initializeModules_0_g$ (Adminlab-0.js:43:95)
at Oxd_g$ (Adminlab-0.js:120692:98)
at Rxd_g$ (Adminlab-0.js:120784:41)
at Adminlab-0.js:120742:25
at Dvf_g$ (Adminlab-0.js:57:105)
at Adminlab-0.js:389913:46

[Isomorphic]

The provided obfuscated stack traces are of limited usefulness. Can you uncomment the lines

<arg line="-optimize 0"  />
<arg line="-style PRETTY"/>

under the "gwtc" target in the build.xml for your project and rebuild it?