Hello tonyng05

Please send us as many details as possible of the operating system you use and other details. In addition please include literally the errror messages you get.

In my opinion the easiest way to check OpenModelica is opening OpenModelica Notebook and running the examples. If you like one of them you can change it and see the results.

Please try all of this and tell us the results

Hi,

If you're using Windows, I suggest you do this:
1. restart the computer (so that all the omc processes are stopped)
2. uninstall OpenModelica and remove c:\OpenModelica1.x.y
3. get the latest nightly-build from here:
    https://build.openmodelica.org/omc/buil … ly-builds/
4. install the nightly build

Start OMedit (OpenModelica Connection Editor), go to Modelica.Blocks.Examples.PID_Controller and try to simulate it.

Also, let us know what operating system are you using: Windows (Xp, 7, Vista) 32/64 bit, Linux, MacOS?

Cheers,
Adrian Pop/

Hi @Koldo and @adrpo, first thanks in advance for your quick answers.

Well I thought the problem had been solve because I had to unistall the OpenModelica version that I had (version 1.9 beta 4) and install a older version (1.8.1) and some examples works now, but some others still doesn't work .

Im using modelica with Windows Vista Enterprise SP2 32bits.

For example I want to take the counter example Modelica.Electrical.Digital.Examples.Counter and I get the following message:
******Translation    16:26:34        0:0-0:0    Internal error sorting equations(strongComponents failed)******

something like that with Modelica.Mechanics.MultyBody.Examples.Elementary.Pendulum
******Translation    16:50:58    C:/OpenModelica1.8.1/lib/omlibrary/Modelica 3.1/Mechanics/MultiBody/parts.mo    712:5-714:42    Variable body.phi_d: Non-array modification 'if body.enforceStates then if body.useQuaternions then StateSelect.never else StateSelect.always else StateSelect.avoid' for array component, possibly due to missing 'each'.***********

One more with Modelica.Electrical.Analog.Examples.AmplifierWithOpAmpDetailed:

******Symbolic    16:56:16    C:/OpenModelica1.8.1/lib/omlibrary/Modelica 3.1/Electrical/Analog/Basic.mo    1798:6-1801:12    If-equation with conditions that are not parameter expressions must have the same number of equations in each branch, equation count is {2,0} for each respective branch:
  opAmp.v_source = opAmp.q_fp1;
,  opAmp.x = 0.0;

I dont know if Im doing something wrong.

Thaks for your help.

P.D. @adrpo PID Controller example works correctly.