java.lang.UnsupportedOperationException: Cannot convert expression to MX: size(A, 1)

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java.lang.UnsupportedOperationException: Cannot convert expression to MX: size(A, 1)
at org.jmodelica.optimica.compiler.FExp.toMX(FExp.java:4516)
at org.jmodelica.optimica.compiler.FMaxExp.toMX(FMaxExp.java:560)
at org.jmodelica.optimica.compiler.FExp.toMXVector(FExp.java:4497)
at org.jmodelica.optimica.compiler.FAssignStmt.updateExpressionsAccordingToStatement(FAssignStmt.java:385)
at org.jmodelica.optimica.compiler.FFunctionDecl.generateFinalExpressionVector(FFunctionDecl.java:1365)
at org.jmodelica.optimica.compiler.FFunctionDecl.toMXFunction_compute(FFunctionDecl.java:2878)
at org.jmodelica.optimica.compiler.FFunctionDecl.toMXFunction(FFunctionDecl.java:2865)
at org.jmodelica.optimica.compiler.FFunctionCall.toMXVector(FFunctionCall.java:1578)
at org.jmodelica.optimica.compiler.FFunctionCallStmt.updateExpressionsAccordingToStatement(FFunctionCallStmt.java:391)
at org.jmodelica.optimica.compiler.FFunctionDecl.generateFinalExpressionVector(FFunctionDecl.java:1365)
at org.jmodelica.optimica.compiler.FFunctionDecl.toMXFunction_compute(FFunctionDecl.java:2878)
at org.jmodelica.optimica.compiler.FFunctionDecl.toMXFunction(FFunctionDecl.java:2865)
at org.jmodelica.optimica.compiler.FFunctionCall.toMXVector(FFunctionCall.java:1578)
at org.jmodelica.optimica.compiler.FFunctionCallStmt.updateExpressionsAccordingToStatement(FFunctionCallStmt.java:391)
at org.jmodelica.optimica.compiler.FFunctionDecl.generateFinalExpressionVector(FFunctionDecl.java:1365)
at org.jmodelica.optimica.compiler.FFunctionDecl.toMXFunction_compute(FFunctionDecl.java:2878)
at org.jmodelica.optimica.compiler.FFunctionDecl.toMXFunction(FFunctionDecl.java:2865)
at org.jmodelica.optimica.compiler.FFunctionCall.toMXVector(FFunctionCall.java:1578)
at org.jmodelica.optimica.compiler.FFunctionCall.toMX(FFunctionCall.java:1562)
at org.jmodelica.optimica.compiler.FDotSubExp.toMX(FDotSubExp.java:544)
at org.jmodelica.optimica.compiler.FVariable.parameterEquationToMXBindingExpression(FVariable.java:3807)
at org.jmodelica.optimica.compiler.FVariable.findMXBindingExpressionIfPresent(FVariable.java:3770)

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