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INVALID_ACCESS_LEVEL when convert the lead

I have an issue when converting a lead using API on sandbox. It gives a error INVALID_ACCESS_LEVEL. I am unabe to understand whats the issue. It was working fine from last 2 years but yesterday suddenly occured the error INVALID_ACCESS_LEVEL when converting the lead. I have already update the password and security tocken on sandbox.

I am using convertLead function to convert the lead.

Can anybody please help me on it.

Thanks in advance