HI
Please check the below links and Note’s
http://www.upenn.edu/computing/da/bo/webi/qna/iv_webi_ERR_WIS_30270.html
Note 1497849 - "An internal error occured while calling 'executeDrillAction' API. (Error: ERR_WIS_30270)" when drilling up on a dimension of a webi report based on BW
Note 1290720 - Error: An Internal error occured while calling 'SubmitReport' API (Error: ERR_WIS_30270) while refreshing migrated WebIntelligence reports in edit mode
Note 1436964 - An internal error occured while calling 'processDPCommands' API. (Error: ERR_WIS_30270)
how to increase swap timeout:
https://bosap-support.wdf.sap.corp/sap/support/notes/1308143
https://bosap-support.wdf.sap.corp/sap/support/notes/1417838
I think it's related to server connectivity error. please check with basis team or Finally try to new installation