TestComplete throws strange error

Hi,

I am automating a desktop application. Everything was working fine. Suddenly TestComplete started throwing error for log.message, project.variables, Sys/aliases etc.. It is throwing error for all TestComplete API we use.Its giving error as Object required 'Project', object required 'aliases' like this.

For log.message it throws errors as wrong number of arguments or invalid property assignment 'log'

Such strange errors are comming. 

Could you please guide on this?

Thanks and Regards,

Swati Nadage