Error on fixed pointed license

[Altera_Forum]

I am new with Adv DSP builder blockset. When I compiled Cholesky Solver model, I met the following errors: 

 Error reported by S-function 'mip_prim' in 'cholesky_solver_mc/cholfwbw/cholesky_fw/bottomdatapath/circularmem/const1 (matlab:open_and_hilite_system ('cholesky_solver_mc/cholfwbw/cholesky_fw/bottomdatapath/circularmem/const1'))': 'cholesky_solver_mc/cholfwbw/cholesky_fw/bottomdatapath/circularmem/const1 (matlab:open_and_hilite_system ('cholesky_solver_mc/cholfwbw/cholesky_fw/bottomdatapath/circularmem/const1'))' requested use of data type 'ufix1'. Use of this data type requires a fixed-point license, but license checkout failed. To use this model without a fixed-point license, select "Fixed-Point Tool" under "Fixed-Point" from the model's Tools menu. Select the root model in Model Hierarchy. Set "Fixed-point instrumentation mode" to be "Force off", "Data type override" to be "Double" and "Data type override applies to" to be "All numeric types". This replaces most uses of fixed-point data types with floating-point doubles. In rare cases, a few attempts to use restricted data types may still exist. Reconfiguring to use floating-point types and/or inserting Typecasts is necessary in these cases.  The following is the content from ver commend about matlab toolbox: ------------------------------------------------------------------------------------- MATLAB Version 7.12.0.635 (R2011a) MATLAB License Number:# ##### Operating System: Microsoft Windows 7 Version 6.1 (Build 7600) Java VM Version: Java 1.6.0_17-b04 with Sun Microsystems Inc. Java HotSpot(TM) Client VM mixed mode ------------------------------------------------------------------------------------- MATLAB Version 7.12 (R2011a)  Simulink Version 7.7 (R2011a)  Altera DSP Builder Advanced Blockset Flow Tools Version 12.0 Build 178 Altera DSP Builder Standard Blockset Version 12.0 Build 178 Curve Fitting Toolbox Version 3.1 (R2011a)  Fixed-Point Toolbox Version 3.3 (R2011a)  Image Acquisition Toolbox Version 4.1 (R2011a)  Image Processing Toolbox Version 7.2 (R2011a)  Signal Processing Toolbox Version 6.15 (R2011a)  Symbolic Math Toolbox Version 5.6 (R2011a)  >>   My questions: (1) What is difference between matlab fixed-point toolbox and Simulink fixed point? (2) Where is the S-Function "mip-prim"? (3) Can I change fixed-point to int or floating-point used by Cholesky solver?   Thanks in advance, Jiuxiang