Fatal Error C1900

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Il mismatch between 'tool1' version 'number1' and 'tool2' version 'number2'

Tools run in various passes of the compiler do not match. number1 and number2 refer to the dates on the files. For example, in pass 1, the compiler front end runs (c1.dll) and in pass 2, the compiler back end runs (c2.dll). The dates on the files must match and if they do not, reinstall and use the current version of each tool.