* To evaluate the safety and tolerability of ERAS-007 monotherapy administered once weekly (QW) and twice daily-once weekly (BID-QW). * To determine the Maximum Tolerated Dose (MTD) and/or Recommended Dose (RD) of ERAS-007 monotherapy administered BID-QW. * To characterize the pharmacokinetic (PK) profile of ERAS-007 monotherapy. * To determine the optimal dose and schedule of ERAS-007 monotherapy. * To evaluate antitumor activity of ERAS-007 in various solid tumors. * To evaluate the safety and tolerability of ERAS-007 (BID-QW) and ERAS-601 (twice daily for three weeks on and 1 week off (BID 3/1)) when administered in combination. * To determine the Maximum Tolerated Dose (MTD) and/or Recommended Dose (RD) of ERAS-007 administered in combination with ERAS-601. * To characterize the pharmacokinetic (PK) profile of ERAS-007 and ERAS-601 when administered in combination. * To evaluate antitumor activity of ERAS-007 and ERAS-601 when administered in combination in various solid tumors * To evaluate antitumor activity of ERAS-007 and ERAS-601 when administered in combination in various solid tumors