see the log file
/omnetpp-5.1.1/ide/omnetpp.app/Contents/Eclipse/configuration/1497570623597.log.
and the log file is as follow:
!ENTRY org.eclipse.cdt.codan.ui.cxx 2 0 2017-06-15 16:50:26.348
!MESSAGE Could not resolve module: org.eclipse.cdt.codan.ui.cxx [59]
Unresolved requirement: Require-Bundle: org.eclipse.ui
-> Bundle-SymbolicName: org.eclipse.ui; bundle-version="3.108.1.v20160929-1045"; singleton:="true"
org.eclipse.ui [310]
Unresolved requirement: Require-Bundle: org.eclipse.core.runtime; bundle-version="[3.2.0,4.0.0)"
-> Bundle-SymbolicName: org.eclipse.core.runtime; bundle-version="3.12.0.v20160606-1342"; singleton:="true"
org.eclipse.core.runtime [99]
Unresolved requirement: Require-Capability: osgi.ee; filter:="(&(osgi.ee=JavaSE)(version=1.7))"
Unresolved requirement: Require-Bundle: org.eclipse.equinox.common; bundle-version="[3.8.0,4.0.0)"; visibility:="reexport"
-> Bundle-SymbolicName: org.eclipse.equinox.common; bundle-version="3.8.0.v20160509-1230"; singleton:="true"
org.eclipse.equinox.common [159]
Unresolved requirement: Require-Capability: osgi.ee; filter:="(&(osgi.ee=JavaSE)(version=1.7))"
Unresolved requirement: Require-Bundle: org.eclipse.equinox.registry; bundle-version="[3.4.0,4.0.0)"; visibility:="reexport"
-> Bundle-SymbolicName: org.eclipse.equinox.registry; bundle-version="3.6.100.v20160223-2218"; singleton:="true"
org.eclipse.equinox.registry [201]
Unresolved requirement: Require-Bundle: org.eclipse.equinox.common; bundle-version="[3.7.0,4.0.0)"
-> Bundle-SymbolicName: org.eclipse.equinox.common; bundle-version="3.8.0.v20160509-1230"; singleton:="true"
Unresolved requirement: Import-Package: org.eclipse.core.runtime.jobs; resolution:="optional"
-> Export-Package: org.eclipse.core.runtime.jobs; bundle-version="3.8.0.v20160509-0411"; bundle-symbolic-name="org.eclipse.core.jobs"; version="0.0.0"
Unresolved requirement: Require-Bundle: org.eclipse.equinox.common; bundle-version="[3.8.0,4.0.0)"
-> Bundle-SymbolicName: org.eclipse.equinox.common; bundle-version="3.8.0.v20160509-1230"; singleton:="true"
Unresolved requirement: Require-Bundle: org.eclipse.equinox.preferences; bundle-version="[3.4.0,4.0.0)"; visibility:="reexport"
-> Bundle-SymbolicName: org.eclipse.equinox.preferences; bundle-version="3.6.1.v20160815-1406"; singleton:="true"
org.eclipse.equinox.preferences [200]
Unresolved requirement: Require-Bundle: org.eclipse.equinox.common; bundle-version="[3.2.0,4.0.0)"
-> Bundle-SymbolicName: org.eclipse.equinox.common; bundle-version="3.8.0.v20160509-1230"; singleton:="true"
Unresolved requirement: Require-Bundle: org.eclipse.equinox.app; bundle-version="1.0.0"; visibility:="reexport"
-> Bundle-SymbolicName: org.eclipse.equinox.app; bundle-version="1.3.400.v20150715-1528"; singleton:="true"
org.eclipse.equinox.app [157]
Unresolved requirement: Require-Bundle: org.eclipse.equinox.registry; bundle-version="[3.4.0,4.0.0)"
-> Bundle-SymbolicName: org.eclipse.equinox.registry; bundle-version="3.6.100.v20160223-2218"; singleton:="true"
Unresolved requirement: Require-Bundle: org.eclipse.core.contenttype; bundle-version="[3.3.0,4.0.0)"; visibility:="reexport"
-> Bundle-SymbolicName: org.eclipse.core.contenttype; bundle-version="3.5.100.v20160418-1621"; singleton:="true"
org.eclipse.core.contenttype [86]
Unresolved requirement: Require-Bundle: org.eclipse.equinox.preferences; bundle-version="[3.2.0,4.0.0)"
-> Bundle-SymbolicName: org.eclipse.equinox.preferences; bundle-version="3.6.1.v20160815-1406"; singleton:="true"
Unresolved requirement: Require-Bundle: org.eclipse.core.jobs; bundle-version="[3.2.0,4.0.0)"; visibility:="reexport"
-> Bundle-SymbolicName: org.eclipse.core.jobs; bundle-version="3.8.0.v20160509-0411"; singleton:="true"