3068824 - MDX statement error: Instantiation of calculation model failed;exception error when refreshing data in EPM Report / Input schedules

When refreshing data in EPM Report / Input schedules,  we get the error message below

One or more errors occurred.
The execution of report Default Report failed. Please contact your administrator.
Bad request .

Server message:

code: UJO_READ_EXCEPTION_018
severity: error
description: MDX statement error: Instantiation of calculation model failed;exception 306002: An internal error occurred
/[Request Info: Object Name = ...
log id: 051MeqTy7kkhuJaAYY0jh0
DATAVALUE:Instantiation of calculation model failed;exception 306002: An internal error occurred
/[Request Info: Object Name = ...
MDX:
V1:Instantiation of calculation model failed;exceptio
V2:n 306002: An internal error occurred
/[Request Inf
V3:o: Object Name = ...
V4:

-----------------

Framework message:
The remote server returned an error: (400) Bad Request.
The remote server returned an error: (400) Bad Request.

When we try to set a member formulas, we get the error message below:

"Dimension processing needed to activate the modified formulas"

"SQL processing error: Error occurred while executing a MDX statement. The error message is: Cube XXXX could not be found. Please check if the Cube is valid and exists."

• SAP  Business Planning and Consolidation 11.1 for Netweaver.
• SAP BW/4HANA 2.0

EPM, BPC  NW, Business Planning and Consolidation for NetWeaver, SAP BPC FOR NetWeaver, BPCNW, Embedded, standard, classic, unified, BOPC, input form, epm add-in , KBA , EPM-BPC-BW4-INF-SQE , BPC/4 - Shared Query Engine , Problem