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An internal error occurred during: "C/C++ Indexer".

I just received a project from a coworker and for some reason I cannot open it. this is the error CCS is giving me

See details below.
  Error: Import failed for project 'TSv2_delfino' because its meta-data cannot be interpreted. Please contact support.

I have CCS 5.5 and my coworker has C5.4.

Note: After I got such error, even all projects, that used to open without errors, have the same error, but they still fully load.

I have attached the metafiles