SAP NetWeaver Visual Composer Storyboard Errors

Hi all, wonder anyone could help me out

when i try to create new model in Visual Composer. i just popup this error message

"<b>Login Error

com.sap.ds.core.project.Project.deleteResour(Ljava/lang/String;)V</b>"

after that when i try to delete the previous created new model, and it popup this error message.

"<b>Failed to delete MyModels/12.mdl. Model is locked by Administrator."</b>

wonder anyone got encounter this problem and can solve it

but then i try to open this model it show me this msg

"<b>Login Error

com.sap.ds.core.project.Project.deleteResour(Ljava/lang/String;)V</b>"

but i wonder what happen to i. plus i also cannot delete away also.. is there anyway to solve it.. but i able to open the examples and also insert views and etc

<b>EDMExample.mdl

EducationDataModelExample.mdl</b>

so i wonder why??