NPE while opening report file

Hello,
Recently I created report in eclipse Kelper (4.3.2) with BIRT things installed.
 
In dynamic web project I created report for customer - privacy policy - can not attach it, but it is simple.
It has:
1 database connection
2 data sets
1 grid
2 tables
1 chart
 
and added some scripts to check if startDate and endDate is higher than 31 days or not - according this some of above parts will be visible or not.
 
Everything works fine when I design it. Even "View Report" shows results that makes me happy about completed work.
 
But when I shut down Eclipse, start it again and want to open report design then no design shows - only information about NullPointerException appears

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minthril

I found the issue (but it is weird)
 
I do not know why but changing in Master Page format of report page to A3 causes it. When I change to A3 format I can design and so on. But when I close this report, change Eclipse perspective to "Java EE" and then choose ths report again then I get this errors. The same result I get in BIRT report designer. Even in situation when I have blank report and just change format to A3 - close report and reopen.
 
Could someone make test like this in Eclipse (with Birt and Java EE perspective):
- in any web project add report (in Java EE perspective)
- open this report and change its format from letter to A3 (Birt perspective)
- close this report, change to "Java EE" perspective
- open report again
 
I doubt that is Eclipse&BIRT issue but I would like to confirmation from anyone. If that works so problem is in my java.
 
Best regards,
minthril